Forte New Generation Engine Flush

FLUSH
Forte New Generation Engine Flush

When did you last
clean your
engine oil?

Modern diesel, turbo, DPF, SCR and start/stop engines run hotter and tighter than ever — and biodiesel & ethanol fuels leave behind sludge, varnish and moisture an oil change can't remove. Forte New Generation Engine Flush clears all of it in 15 minutes — and it's safe for wet-belt engines.

Order for £17 → How it works
★★★★★
Free UK delivery · Safe for all engines including TBIO · Use at every service
Forte New Generation Engine Flush bottle — engine oil system cleaner removes sludge varnish and carbon deposits in 15 minutes before oil change
Does your engine need a flush?
🛢️
Black or very dark oil on the dipstick
Oil that turns black quickly after an oil change is carrying high levels of contamination. A flush removes what an oil change leaves behind.
Time for a flush
🔧
Noisy hydraulic valve lifters
A ticking or tapping noise from the engine — especially on cold starts — often caused by contamination clogging hydraulic valve lifters.
Time for a flush
⚠️
Engine warning or oil pressure light
Sludge and contamination can block oil pick-up pipes and restrict oil flow — triggering oil pressure warnings and engine management lights.
Time for a flush
📋
Extended service intervals or short journeys
Oil left in longer than it should be, or engines that do lots of short journeys, accumulate contamination faster than normal.
Time for a flush
The problem

The Modern Oil Change Is No Longer Enough

Every oil change removes the old oil — but it leaves behind the sludge, varnish and carbon deposits that have built up in the engine since the last service.

Modern driving conditions make this worse than ever. Extended service intervals, stop/start systems, short journeys that never fully warm the engine, and biofuels like E10 and B7 all accelerate contamination build-up. The oil degrades faster, leaves more deposits, and those deposits cause real problems — blocked oil pick-up pipes, sticking piston rings, clogged hydraulic valve lifters and variable valve timing faults.

A standard oil change simply drains the liquid oil. It cannot remove the solid contamination baked onto internal surfaces. That contamination stays in the engine and immediately begins degrading the fresh oil you have just put in.

Forte New Generation Engine Flush removes all of it — in 15 minutes, before the oil change, as part of a normal service.

The modern oil change is no longer enough — showing how extended service intervals, stop/start driving, short journeys and biofuels leave sludge varnish and carbon deposits that a standard oil drain cannot remove
The 20 minute engine reset — showing how Forte New Generation Engine Flush cleans the entire oil system freeing sticking piston rings, unclogging hydraulic valve lifters, restoring VVT systems and stripping lacquer from the crankcase in 15-20 minutes before an oil change
What it does

What Does Forte New Generation Engine Flush Do?

Forte New Generation Engine Flush cleans the entire engine oil system in 15-20 minutes — removing the contamination that a standard oil change leaves behind.
  • ✓
    Removes sludge, varnish and lacquer from crankcase Contamination that stays in the engine after a standard oil change and degrades fresh oil immediately
  • ✓
    Frees sticking piston rings Sticky piston rings cause oil consumption and smoke — the flush removes the deposits causing them to stick
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    Unclogs hydraulic valve lifters Removes the contamination causing the ticking and tapping noise many drivers notice on cold starts
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    Restores variable valve timing systems VVT systems are extremely sensitive to oil contamination — deposits cause them to stick and trigger fault codes
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    Safe for TBIO wet belt engines Safe for, and specifically recommended for, engines with a timing belt running in oil
Instructions

How To Use Forte New Generation Engine Flush

Three steps. 15-20 minutes. Done as part of your normal oil change — no extra time, no dismantling, no specialist equipment. Use at every service.

1
Add
Add to old engine oil
Add the full bottle to the existing engine oil 15-20 minutes before your scheduled oil change. No draining required first.
2
Idle
Run at operating temperature
Run the engine at normal operating temperature for 15-20 minutes. The product circulates through the oil system dissolving deposits and freeing contaminated components.
3
Drain
Drain and change oil as normal
Drain the oil and change the filter as normal. The contamination goes out with the old oil. Refill with fresh oil into a completely clean system.
Why it matters

Purge The System — Don't Just Drain It

A standard oil drain removes the liquid oil. Forte New Generation Engine Flush removes the solid contamination that the drain cannot touch — giving fresh oil a genuinely clean system to work in.

When fresh oil goes into a contaminated engine it immediately begins picking up the deposits left behind from the previous oil. Within days the new oil is already carrying contamination. Within weeks it is significantly degraded.

Flushing first means fresh oil goes into a clean system. It stays cleaner longer, provides better protection and allows any additional treatments like Forte Oil Fortifier or Forte Seal Conditioner to reach and treat their target components without contamination blocking them.

Purge the system don't just drain it — showing the difference between a standard oil drain which only removes liquid oil and Forte New Generation Engine Flush which removes the solid sludge varnish and deposits that remain after draining
Real world results

Does Forte New Generation Engine Flush Work?

Tested by real garages — clinical diagnostic results showing Audi A3 174k miles oil warning light cured by 1 hour flush, BMW 530d 148k miles DPF warning and limp mode resolved, Porsche Boxster S 60k miles VVT fault code P1341 cleared, Vauxhall Astra 89k miles noisy hydraulic valve lifters cured, BMW 750 5.0L 88k miles burning 1 litre oil every 300-400 miles fixed with Engine Flush followed by Oil Fortifier
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    Audi A3 1.8L Petrol Turbo — 174,000 miles Oil warning light flashing under load. Contamination build-up in sump and oil pick-up pipe. Cured by a 1-hour engine flush.
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    BMW 530d 3.0L — 148,000 miles Limp mode, engine management and DPF warning lights. Resolved using an extended engine flush alongside Forte Diesel Injector Cleaner and DPF Cleaner.
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    Porsche Boxster S 3.2L — 60,000 miles Hunting on idle, VVT fault code P1341 — sticking variable valve timing. Cured by a 1-hour engine flush with Forte Top End Treatment added to the new oil.
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    Vauxhall Astra 1.4 16v Twinport — 89,000 miles Excessive noise from hydraulic valve lifters and timing chain from contaminated oil. Cured by a 2.5-hour flush with Forte Top End Treatment and Forte Oil System Protector added to the new oil.
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    BMW 750 5.0L — 88,000 miles Burning 1 litre of oil every 300-400 miles. Fixed by 2 x Forte New Generation Engine Flush with 500 miles driving between, followed by an oil change with 2 x Forte Oil Fortifier. After 1,500 miles smoke had stopped completely.
Common concern

Does Forte New Generation Engine Flush Cause Oil Leaks?

No. Forte New Generation Engine Flush does not cause oil leaks. What it can do is reveal leaks that were already there.

Over time, sludge and contamination builds up around worn or leaking seals. This contamination can temporarily plug a minor seal leak — the engine appears fine on the outside. When Forte New Generation Engine Flush removes that contamination, the underlying leak that was already there becomes visible.

This is not new damage. The leak existed before the flush — the sludge was simply hiding it.

Not flushing means chasing leaks one by one as the contamination plugs eventually fail. Using Forte New Generation Engine Flush regularly means finding all existing leaks at once — so everything can be fixed together. That is better for the engine and far less frustrating long term.

Engine flush does not cause leaks it reveals them — showing the illusion where contamination temporarily plugs failing seals, the clean where flush removes the sludge, and the reality where the underlying leak becomes visible. This is not new damage.
Compatibility

Is Forte New Generation Engine Flush Safe For TBIO Wet Belt Engines?

Yes — and for TBIO engines it is not just safe, it is actively recommended. Clean oil is essential for wet timing belt longevity.

TBIO engines — those where the timing belt runs inside the engine immersed in oil — are particularly vulnerable to oil contamination. The belt material can be damaged by sludge, carbon deposits and metal particles in degraded oil.

Common TBIO engines include Ford 1.0 EcoBoost, Ford 1.5 and 1.6 TDCi, Volkswagen Group 1.0, 1.2 and 1.4 TSI/TDI small capacity engines, and PSA Group (Peugeot, Citroën) 1.2 PureTech. If your vehicle has one of these engines, using Forte New Generation Engine Flush at every service is particularly important.

Also safe for all petrol and diesel engines, hybrids, DPF vehicles and start-stop systems.

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    All petrol engines Including HPDI, turbo and hybrid
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    All diesel engines Including DPF vehicles and turbo diesel
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    TBIO wet belt engines Safe for and specifically recommended
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    Start-stop systems Safe for all modern start-stop equipped vehicles
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    Hybrid vehicles Compatible with all hybrid engine configurations
Diagnostic codes

What Fault Codes Are Linked
to a Contaminated Oil System?

On modern diesel, turbo and start/stop engines, biodiesel and ethanol contamination thickens into sludge and varnish that blocks the narrow oil galleries feeding the VVT and starves oil pressure. Forte New Generation Engine Flush clears that contamination. If you're seeing these alongside a dirty service history, sludge is a likely cause.

  • P0011
    P0014
    P0021
    Camshaft Timing Over-Advanced (VVT / VANOS) Variable valve timing needs clean oil through tiny solenoid passages. Sludge from fuel-diluted oil blocks them and the timing can't adjust. Flushing the contamination restores oil flow to the VVT system. Secondary code.
  • P0520
    P0521
    P0522
    Engine Oil Pressure Sensor / Low Oil Pressure Sludge restricts oil flow and can clog the pump pickup, dropping pressure or skewing the sensor. A flush removes the deposits choking the system. Investigate a failed pump/sensor too. Secondary code.
  • P0341
    Camshaft Position Sensor Range / Performance Varnish around the cam phaser and sensor can skew the camshaft signal on a neglected modern engine. Cleaning the oil system often clears intermittent versions. Secondary code.

Important: a flush clears the sludge behind these codes — it isn't a substitute for diagnosing a mechanical fault. If a code persists after a flush and fresh oil, get it investigated. Ask Phil if unsure.

Before adding treatments

Why Should I Flush Before Adding Forte Oil Fortifier or Forte Seal Conditioner?

A clean oil system gives any subsequent treatment the best possible chance to reach and treat the components it is designed for.

When you add Forte Oil Fortifier or Forte Seal Conditioner to contaminated oil, those products have to work in an environment full of sludge and deposits. Some of the treatment may be absorbed by the contamination rather than reaching the target components.

Flushing first removes the contamination. The oil treatments then go into a clean system and can reach their target components — piston rings, valve stem seals, hydraulic valve lifters — with nothing blocking them.

The BMW 750 case study above demonstrates exactly why this matters — Engine Flush first, then Oil Fortifier, completely resolved a severe oil consumption problem that had been getting progressively worse.

The recommended order
  • 1
    Forte New Generation Engine Flush Add to old oil 15-20 minutes before oil change. Drain old oil with contamination.
  • 2
    Fresh oil and filter Refill with correct grade fresh engine oil and a new oil filter.
  • 3
    Forte Oil Fortifier For high mileage engines showing wear — add to the fresh oil.
  • 4
    Forte Seal Conditioner If treating valve stem seal smoke — add after driving for a day on fresh oil with Oil Fortifier.
  • 5
    Forte Oil System Protector Add to fresh oil to maintain stability and prevent contamination build-up until next service.
The value question

Is Forte New Generation Engine Flush Worth It?

Yes. At £17 it is one of the lowest cost preventative maintenance steps available — and the case studies show it can resolve problems that would otherwise require expensive diagnosis and repair.

Used at every service as a preventative measure it keeps the oil system clean so contamination-related problems are less likely to develop. The cost is £17 per service — a small addition to any oil change that protects precision components like VVT systems and hydraulic valve lifters that can be expensive to repair.

For anyone adding Forte Oil Fortifier or Forte Seal Conditioner, flushing first is not optional — it is what makes those treatments work properly.

The honest calculation
  • £
    Cost per service — £17 Added to engine oil 15 minutes before every oil change
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    Protects precision components VVT systems, hydraulic valve lifters and piston rings all benefit from a clean oil system
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    New oil stays cleaner longer Fresh oil in a clean system degrades more slowly and provides better protection
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    Maximises oil treatments Forte Oil Fortifier and Forte Seal Conditioner work better in a clean oil system
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    Safe for all engines including TBIO No exceptions — use at every service regardless of engine type
Common questions

Every question about
Forte New Generation Engine Flush, answered.

Is engine flush good for diesel engines?
Yes. Modern diesels with DPFs, turbos, EGR and start-stop accumulate contamination quickly, so a clean oil system matters. Forte New Generation Engine Flush is designed for exactly these engines — it removes sludge, carbon and moisture before an oil change without harming sensitive components, and is safe for DPF, SCR and wet-belt (TBIO) diesels.
Can I use engine flush on a wet belt engine?
Use the right one. A traditional aggressive flush isn't advised on wet-belt (TBIO) engines, but this New Generation flush is specifically formulated and recommended for them — it cleans the oil system without harming the internal drive belt. Clean oil is essential to wet-belt longevity, so flushing with the correct product at every oil change protects the belt rather than threatening it.
How much does a diesel engine flush cost?
A bottle of Forte New Generation Engine Flush is £17 and you add it yourself 15-20 minutes before your oil change — one of the lowest-cost things you can do for a modern engine, and far cheaper than the diagnosis and repair bills a contaminated oil system can lead to.
New Generation vs Advanced Formula Engine Flush — which do I need?
New Generation Engine Flush is the modern, gentler upgrade — built for diesel turbo, DPF, SCR, start/stop and wet-belt engines, and for combating biodiesel/ethanol contamination and moisture. Forte Engine Flush (Advanced Formula) is the traditional strong flush for older, high-mileage, heavily-sludged engines — but it is not for wet-belt engines. Modern or diesel engine? Choose New Generation. Older petrol engine with years of sludge? Choose Advanced Formula.
Will Forte New Generation Engine Flush damage my engine?
No. Forte New Generation Engine Flush is specifically formulated to be safe in all petrol and diesel engines including TBIO wet belt engines, hybrids and DPF vehicles. It does not damage engine components when used as directed.
Can I use Forte New Generation Engine Flush on a high mileage engine?
Yes — high mileage engines are often the ones that benefit most as they have had more time to accumulate contamination. The BMW 750 case study involved an 88,000 mile engine. Always follow the instructions and do not extend the flush time beyond 15-20 minutes.
How often should I use Forte New Generation Engine Flush?
Forte recommend using it at every service as part of a standard oil change routine. Used regularly it prevents contamination from building up rather than having to address the problems it causes later.
Can I use it if my engine is already making a noise?
Yes. If the noise is caused by contamination clogging hydraulic valve lifters or sticking VVT components, Forte New Generation Engine Flush may help resolve it. For best results use alongside Forte Top End Treatment added to the fresh oil after the flush.
Should I use Forte New Generation Engine Flush before adding Forte Oil Fortifier?
Yes — always flush first. A clean oil system allows Forte Oil Fortifier to circulate freely and reach the components it needs to treat. The BMW 750 case study demonstrates exactly why this matters.
Is New Generation Engine Flush an upgrade on the original Forte flush?
Yes. New Generation Engine Flush is Forte's improved blend — with greater cleaning and moisture-emulsification capability than the original Advanced Formula flush. It's specifically formulated for modern high-output, tight-tolerance engines and the contamination caused by biodiesel and ethanol fuels and exhaust after-treatment systems. It's the version to choose for modern, diesel, DPF, SCR and wet-belt engines.

Clean engine.
Every service.

At £17 a bottle Forte New Generation Engine Flush is the simplest, lowest cost thing you can do for your engine at every service. Free UK delivery.

£17
Per bottle · Free UK delivery · Use at every service
Order Forte New Generation Engine Flush — £17 →
Use alongside these products
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    Forte Oil System Protector Add to fresh oil after every flush to maintain oil stability and prevent contamination build-up until the next service
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    Forte Top End Treatment Add to fresh oil after the flush if treating noisy hydraulic valve lifters or sticking VVT systems
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    Forte Oil Fortifier Add to fresh oil after the flush on high mileage engines showing signs of wear or oil consumption
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    Forte Seal Conditioner Add after driving for a day on fresh oil with Oil Fortifier if treating valve stem seal smoke
Complete your service

Most people also buy these.

Add to fresh oil after flush
Forte Oil System Protector
Use Forte New Generation Engine Flush to clean the old oil out, then add Forte Oil System Protector to the fresh oil to maintain stability and prevent contamination build-up until the next service.
View Forte Oil System Protector →
For noisy lifters or sticking VVT
Forte Top End Treatment
After flushing, add Forte Top End Treatment to the fresh oil for targeted cleaning of hydraulic valve lifters and variable valve timing systems. Highest detergent rating of any Forte oil product.
View Forte Top End Treatment →
For high mileage engines
Forte Oil Fortifier
For engines showing signs of wear — add Forte Oil Fortifier to the fresh oil after flushing to reduce oil consumption, blue smoke and restore oil pressure. As proven in the BMW 750 case study.
View Forte Oil Fortifier →

Take A Look At Our 5 Star Reviews For Forte Seal Conditioner

At BMW Tool Rental, we pride ourselves on providing excellent customer service and offering honest and reliable advice to our customers. We understand that when it comes to your car, you want to ensure that you are using the right products and getting the right advice. That's why we take the time to listen to our customers, understand their concerns, and provide the best possible solution.

Our forte seal conditioner has received numerous 5-star reviews from our satisfied customers, who have found our product to be effective in reducing engine oil leaks and stopping blue smoke caused by worn valve seals. However, we don't just rely on product reviews to show our commitment to customer satisfaction. We offer a personal touch that sets us apart from other retailers.

If you have any questions about our products or services, we encourage you to reach out to us. We're always happy to help and provide you with the information you need to make the right decision. Whether you're looking to rent our AGA valve seal tool or purchase our forte seal conditioner, we're here to help.

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Clements Trading Ltd trading as BMW Tool Rental. Registered in England & Wales, company no. 10629836. Registered office: 82a James Carter Road, Mildenhall, Bury St Edmunds, Suffolk, IP28 7DE.

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