World First - Racing-worthy specifications available to everyone.
Motor Milk™ 5W-40 SP/C3
A fully synthetic engine oil manufactured from carefully selected raw materials and developed to provide maximum protection for modern gasoline, diesel, and racing engines.
The product is based on a pure PAO- and ester-based base oil blend suitable for racing. The formulation includes a full SAPS (Sulfated Ash, Phosphorus, Sulfur) level and a high-performance, racing-grade ZDDP additive package.
This combination improves lubrication, ensures excellent wear protection, and optimizes cold starting properties.
Motor Milk™ 5W-40 A3/B4
A synthetic engine oil manufactured from carefully selected raw materials and designed to provide maximum protection for modern gasoline, diesel, and racing engines.
The product is based on a PAO- and ester-based base oil blend suitable for racing. The formulation includes a full SAPS (Sulfated Ash, Phosphorus, Sulfur) level, which improves lubrication, ensures excellent wear protection, and supports reliable operation even during cold starts.
High-quality base oil technology combined with high-performance additives ensures a stable lubricating film even under high temperature and load conditions. Motor Milk™ 5W-40 A3/B4 is ideally suited for demanding street and racing use in engines requiring an A3/B4 class 5W-40 viscosity lubricant.
Which one should I choose?
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If you have a track-focused or heavily tuned vehicle, we primarily recommend Motor Milk's genuine 5W-40 A3/B4 version.
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If your vehicle is a modern, standard (OEM) configuration car and you want to follow the manufacturer's recommended, newer generation C3 classification, the 5W-40 SP/C3 offers modern viscosity and emission specifications, as well as the maximum ZDDP level permitted by that classification.
Motor Milk™ 5W-40 is one of the most technologically advanced SP/C3 class 5W-40 engine oils worldwide.

Motor Milk is not a grocery store oil. It is a lubricant for engines that live on the redline.
Motor Milk™ 5W-40 ensures racing-level performance with the following features:
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Racing-grade viscosity and excellent heat and oxidation resistance - Compare to others
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Durability in demanding, high boost pressure conditions
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Improved protection against sludge formation
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Increased power*
Designed for demanding use.
Motor Milk's unique formulation includes:
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High SAPS content (Sulfated Ash, Phosphorus, Sulfur)
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Abundant ZDDP additives (Zinc Dialkyldithiophosphate)
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High ester content
What does this mean in practice?
- Exceptional thermal stability
- Extremely strong oil film under heavy load
- Better protection in turbocharged and tuned engines
- More effective cleaning – cleaner engine internals
Why isn't regular "premium" oil enough?
Current emission requirements and cost savings have weakened the composition of many oils on the market. Additives have been reduced, and protective properties have been cut.
Regular "premium" oil works for street driving, but not under demanding loads.
High viscosity even above 100 degrees - Compare to others.
High viscosity ensures:
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Stable oil pressure under heavy load
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Reliable protection in the extreme temperatures of turbocharged engines
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Strong lubricating film even at high RPMs
The rich ester base improves lubrication and helps keep the internal components of the engine cleaner – even in harsh conditions.
Philosophy: No Compromises
Motor Milk
Designed for those who demand the absolute best.
Choose lubrication that endures where others give up.
Available in 1L and 5L bottles.
5W40 A3/B4 Specs.
5W40 C3 Specs
QT Parts is the official importer of MOTOR MILK™ products. For corporate sales, please contact Sami / +358 50 547 5771.