The BMW S55 is one of the most iconic M engines of the modern era. Introduced in 2014, it marked the first time a turbocharged inline six powered the legendary M3 and M4. Built on the base of the N55 but extensively reengineered by BMW M GmbH, the S55 featured Motorsport level upgrades such as a closed deck block, twin mono-scroll turbochargers, and an advanced cooling system. It combined everyday usability with track ready strength, setting the standard for a new generation of M cars.
Choosing the Best Oil for BMW S55 is one of the most important aspects of keeping this engine healthy. With high boost, elevated cylinder pressures, and track capability, the oil must be able to withstand extreme demands. In this guide, we’ll cover the S55’s technical highlights, list its different variants and power outputs, explain the best oils to use, and answer the key question: How much oil does the S55 take?
The BMW S55 engine family
The S55 is a 3.0 liter inline six that delivers Motorsport performance while retaining BMW refinement. It uses two mono-scroll turbochargers (one for each bank of three cylinders), a closed deck crankcase for durability, and twin wire arc sprayed cylinder liners for reduced friction and wear resistance. The engine also employs Grafal coated aluminum pistons, forged internals, and BMW’s Valvetronic variable valve lift with Double VANOS camshaft control.
Key technical figures include an 84 mm bore, 89.6 mm stroke, and a 10.2:1 compression ratio. These specifications allow the S55 to handle high boost pressures while remaining flexible and efficient.
Here’s a breakdown of its main power levels and applications:
| Output | Variant / Notes | Representative models | Production years |
|---|---|---|---|
| 404 hp | Standard road trim | M2 Competition (F87) | 2018-2021 |
| 425 hp | Base output | M3 (F80), M4 Coupé/Convertible (F82/F83) | 2014-2018 |
| 444 hp | Competition Package | M3 (F80 Competition), M4 (F82/F83 Competition), M2 CS (F87) | 2016-2021 |
| 453 hp | CS models | M3 CS (F80), M4 CS (F82) | 2017-2020 |
| 493 hp | Track specials | M4 GTS (F82), M4 DTM Champion Edition (F82) | 2015-2017 |
This variety demonstrates how flexible the S55 architecture was. From the standard M3 to limited edition specials like the GTS and CS, the same base engine delivered tailored performance for each car’s purpose.
Best Oil for BMW S55
MOTUL 8100 X-Cess Gen 2 5W40
LIQUI MOLY Special Tec B FE 5W-30
Valvoline European Vehicle 0W-30Best Oil for BMW S55
The S55 runs hot and hard, so BMW specifies only oils that meet the BMW Longlife-01 (LL-01) standard. For most driving conditions, the recommended viscosities are 0W-30 or 5W-30 LL-01. These grades provide the ideal balance of cold start protection, turbocharger lubrication, and high temperature stability.
For track use, very hot climates, or prolonged aggressive driving, many specialists recommend stepping up to an LL-01 approved 5W-40. This oil offers thicker film strength at elevated temperatures, giving an extra margin of protection when oil temperatures climb beyond 260°F.
It’s important to note that unlike earlier naturally aspirated M engines such as the S65, the S55 was not designed for 10W-60. It requires modern synthetic LL-01 oils engineered for turbocharged applications.
Summary:
- Best Oil for BMW S55 in daily driving → 0W-30 or 5W-30 LL-01
- Best Oil for BMW S55 in track use or extreme heat → 5W-40 LL-01
BMW S55 Oil capacity
The BMW S55 has a larger oil capacity than the standard N55, reflecting its Motorsport upgrades. Most S55 equipped models, including the M3, M4, and M2 Competition, require around 6.5 to 7.0 liters of oil with filter.
The safest procedure is to start by adding about 6.5 liters, then run the engine to operating temperature. After shutting it down and waiting a few minutes, check the electronic dipstick via iDrive and top up gradually until the level is correct. Overfilling is risky, as it can cause foaming, crankcase pressure issues, and turbo seal failure.
BMW S55 oil consumption
Like many BMW turbocharged engines, the S55 can consume oil. Some owners report usage of up to one quart every 1,000-1,500 miles, especially under hard driving. BMW considers this within normal limits.
The causes include high boost pressures, elevated exhaust gas temperatures, and aging valve stem seals or turbo seals. Regularly checking and topping up the oil is crucial. Using an LL-01 approved 5W-40 for demanding use can reduce consumption slightly, though it will not eliminate it completely.
Shorter oil change intervals every 5,000 to 6,000 miles instead of BMW’s 10,000 mile recommendation -help minimize oil consumption issues by keeping the oil fresh and less prone to thinning.
Why oil choice is critical for the S55
The S55’s design places extreme stress on its lubrication system. Oil has to cool and protect the turbochargers, withstand high cylinder pressures, and prevent deposits from forming inside the combustion chamber.
Choosing the correct BMW-approved oil ensures:
- Reliable turbocharger lubrication and cooling
- Stable viscosity at extreme temperatures
- Reduced sludge and carbon buildup
- Long-term durability of bearings and pistons
Using non approved oils risks turbo damage, coking, and premature wear of internal components.
Service intervals
BMW’s official oil change interval for the S55 is 10,000 miles or 12 months. While acceptable for warranty purposes, many M specialists recommend shorter intervals of 5,000-6,000 miles. For track-driven cars, changing oil after every few events is best practice.
High quality OEM filters should always be used. The S55’s oil system operates at high pressures, and only properly engineered filters guarantee correct flow and filtration.
Best Oil for BMW S55
MOTUL 8100 X-Cess Gen 2 5W40LIQUI MOLY Special Tec B FE 5W-30Valvoline European Vehicle 0W-30Conclusion – Best Oil for BMW S55
The Best Oil for BMW S55 is any oil carrying the BMW Longlife-01 approval, with 0W-30 or 5W-30 being the standard recommendation. For high stress conditions like track driving or very hot climates, 5W-40 LL-01 is an excellent choice.
With an oil capacity of around 6.5-7.0 liters, regular monitoring and top-ups are essential, especially since the S55 is known to consume some oil under load. More frequent oil changes than BMW’s factory interval will greatly improve long term reliability.
Whether in an M2 Competition, an M3 CS, or an M4 GTS, the S55 is one of BMW M’s most memorable turbocharged engines. Caring for it with the correct oil is the foundation for keeping it strong, reliable, and thrilling for years to come. Choosing the Best Oil for BMW S55 is not just routine maintenance, it is essential to preserving the character of one of BMW’s greatest modern performance engines.
