Forte Oil Fortifier
High mileage
engine burning
oil?
As engines wear, oil slips past piston rings and valve seals causing consumption, blue smoke and dropping oil pressure. Forte Oil Fortifier is an engine oil thickener that safely raises your oil's viscosity — reducing what's getting past and restoring pressure in worn, high-mileage engines.
Why Do High Mileage Engines Burn Oil and Lose Pressure?
In a new engine the tolerances are tight — oil film is controlled precisely by the piston rings and valve stem seals. As mileage builds, the metal surfaces wear microscopically and the clearances open up. Oil that should be kept in the sump begins to slip past the rings into the combustion chamber where it burns, or past the valve guides where it burns on the exhaust valves.
The result is increased oil consumption, blue smoke under load and — because oil is draining through enlarged clearances — dropping oil pressure. Standard oil changes can't fix worn clearances. The metal isn't coming back. But you can give the oil less chance of getting through those gaps.
That's what Forte Oil Fortifier does — it thickens the oil to reduce what's slipping past worn components, and restores the oil pressure that worn clearances have been robbing.
What Does Forte Oil Fortifier Do?
- ✓Safely raises oil viscosity — the right way This is not the same as switching to a thicker oil grade, which can starve a worn engine of flow and cause real damage. Oil Fortifier's advanced viscosity improvers raise the film strength of your existing, correct-grade oil — reducing the amount passing worn piston rings and valve seals, without compromising cold-start flow
- ✓Forms protective film on worn surfaces Anti-wear agents coat worn metal surfaces — slowing further wear and reducing the metal-to-metal contact that causes noise
- ✓Restores dropping oil pressure Thicker oil drains less readily through enlarged clearances — rebuilding oil pressure throughout the lubrication system
- ✓Replenishes depleted viscosity improvers Viscosity improvers in aged oil break down over time — Oil Fortifier replenishes them to maintain oil film integrity between changes
- ✓No drain required Add to existing engine oil via the filler cap — the engine keeps running while it works
Which Forte Oil Product Is Right for Your Engine?
They look similar but they do different jobs. Oil Fortifier is built for worn engines that need restoring. Oil System Protector is built for healthy engines that need protecting. The additive profiles tell the story.
Forte Oil System Protector has a balanced profile — 4 out of 5 across detergents, dispersants and anti-wear, with no viscosity improvers at all. It's designed to keep a healthy engine clean and protected, not to address the worn clearance problem that Oil Fortifier tackles.
High mileage engine burning oil or losing pressure? → Forte Oil Fortifier. Healthy engine, want to maintain it? → Forte Oil System Protector.
BMW 750 5.0L — 1 Litre Every 300 Miles. Fixed.
The diagnosis was suspected bore lacquering and sticking piston rings — the rings weren't worn out, they were gummed up and not sealing correctly. The fix was systematic.
- 1First Forte Engine Flush treatment Added to the existing oil and driven for 500 miles — beginning to dissolve the bore lacquering and free the stuck rings
- 2Oil change — second Forte Engine Flush treatment Fresh oil, second Engine Flush, driven another 500 miles — continuing the cleaning process
- 3Oil change — 2 bottles of Forte Oil Fortifier added Fresh oil with 2 bottles of Oil Fortifier for this large capacity V8 — thickening the oil around the now-freed rings
- 4After 1,500 miles Smoking stopped completely. No oil being used at all. The combination of cleaning and then fortifying the oil resolved a level of consumption most people would have used as justification to scrap the engine.
What Fault Codes Are Linked
to Low Oil Pressure?
As engines wear, clearances open up and oil drains through them too easily — pressure drops and the ECU logs it. By raising the oil's film strength, Forte Oil Fortifier helps a worn engine hold pressure again. If you're seeing these alongside high oil consumption or a noisy top end, worn clearances are the likely cause.
-
P0520
P0521
P0522Engine Oil Pressure Sensor / Low Oil Pressure The core oil-pressure codes — sensor circuit faults, range/performance, or genuinely low pressure. On a high-mileage engine with widened clearances, a thicker oil film helps rebuild pressure and steady the reading. Always rule out a failed sensor or pump first. Secondary code. -
P0524
Engine Oil Pressure Too Low The ECU has detected oil pressure below the safe threshold — often a warning sign on a worn, high-mileage engine. Oil Fortifier's viscosity improvers help restore the oil film and pressure, but persistent low pressure must be investigated mechanically. Secondary code.
-
P0011
P0014Camshaft Timing Over-Advanced (VVT / VANOS) Variable valve timing needs stable oil pressure to work. When pressure drops on a worn engine, the cam phasers can't hold position and these codes appear. Restoring oil pressure supports correct VVT operation. Secondary code.
Important: Oil Fortifier helps a worn engine hold pressure — it is not a fix for a failed oil pump or sensor. If a pressure code persists after treatment, get it diagnosed. Ask Phil if you're unsure.
How Do I Use Forte Oil Fortifier?
- ✓For oil consumption and pressure — use after Engine Flush Use Forte Engine Flush first to clean the engine — then add fresh oil with Forte Oil Fortifier. A clean engine gives Oil Fortifier the best possible environment.
- ✓Also treating valve seals? Add Oil Fortifier first Add Oil Fortifier, drive one day, then add Forte Seal Conditioner. The thicker oil environment gives the seal conditioner the best chance of working.
- ✓Large displacement engines — use two bottles For V8 and larger engines over 4.0 litres use two bottles for the correct concentration in the larger oil volume.
- →Stays in until the next oil change No need to drain — Forte Oil Fortifier remains active in the oil until the next service.
Questions people ask
before they order.
Stop the oil
burning.
Restore the pressure.
Forte Oil Fortifier — highest viscosity improver rating of any Forte oil product. Add to existing oil, no drain required. Free UK delivery.
£18.00
Order Forte Oil Fortifier — £18.00 →- →Forte Engine Flush Use first — clean the engine before adding Oil Fortifier. For bore lacquering or sticking rings use twice with 500 miles between treatments as in the BMW 750 case study.
- →Forte Seal Conditioner If also treating valve stem seals — add Oil Fortifier first, drive one day, then add Forte Seal Conditioner. The two products work together.
- →Forte Top End Treatment If also experiencing noisy valve lifters or VVT issues alongside oil consumption — Forte Top End Treatment targets the upper valve train.
Use alongside these products.
Worn Piston Rings Symptoms: Smoke, Oil Use and Pressure Clues
The source-backed signs are car burning oil between services, blue exhaust smoke, high oil consumption, and a level on the dipstick that keeps dropping. On a high mileage engine burning oil, those symptoms are consistent with oil escaping past worn piston rings or valve stem seals and burning in the combustion chamber.
Blue exhaust smoke is worth treating as an oil-control warning rather than just a nuisance. Forte Oil Fortifier is aimed at the worn-clearance side of that problem: it strengthens the oil film and reduces the amount of oil passing worn internal clearances.
- Oil useFrequent top-ups between services, especially with no external leak, are a classic high oil consumption warning.
- Blue smokeBlue smoke is a source-backed sign that oil is escaping past worn piston rings or valve stem seals and being burnt.
- Hot pressureWorn internal clearances can show as dropping oil pressure when hot because warm oil flows through the gaps more easily.
- LimitsOil Fortifier is a lubrication and viscosity treatment, not a mechanical repair. Severe or persistent oil loss still needs diagnosis.
Where Forte Oil Fortifier fits
Forte Oil Fortifier is an engine burning oil additive for worn, high-mileage engines. Its advanced viscosity improvers strengthen the oil film and reduce the amount of oil passing worn piston rings, valve stem seals and enlarged bearing clearances.
For best results, clean the system first with Forte Advanced Formula Motor Flush, change the oil, then add Oil Fortifier to the fresh oil. If treating valve stem seals as well, add Oil Fortifier before Forte Seal Conditioner.
Low Oil Pressure at Idle When Hot: Why the Oil Light Flickers
Low oil pressure at idle when hot is one of the ways worn internal clearances can show up. As the oil warms, it can pass through worn clearances more easily, so a high mileage engine may show dropping oil pressure when warm.
If the dashboard oil warning appears alongside high oil consumption or other signs of a worn engine, do not ignore it. Forte Oil Fortifier can help where the pressure loss is wear-related because it safely thickens the existing correct-grade oil and helps the engine hold a stronger oil film when warm.
- 1Check the oil level firstOil Fortifier is added to the existing engine oil, so confirm the oil level is correct before adding any treatment.
- 2Do not ignore a constant warning lightOil Fortifier is not a mechanical repair. Persistent pressure warnings still need diagnosis rather than more additive.
- 3Use it for wear-related pressure dropWhen the engine otherwise runs normally but oil pressure drops when warm, the product is aimed at rebuilding film strength and reducing drain through worn clearances.
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.
Clements Trading Ltd
82a James Carter Road
Mildenhall, Bury St Edmunds
Suffolk, IP28 7DE
BMW Tool Rental
63 Purcell Avenue
Lichfield
Staffordshire, WS13 7PH
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.
BMW Tool Rental is an independent specialist supplying tool hire and Forte automotive additives. We are not affiliated with, authorised by, or endorsed by BMW AG. "BMW" is a trademark of BMW AG and is used here for descriptive/compatibility purposes only.
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