T-4MXR Four Stroke Racin g Oil 15w40-12x1-Liter

The T-4MXR Four Stroke Racing Oil 15W40 is a semi-synthetic motor oil engineered for high-performance four-stroke engines that demand superior lubrication under extreme racing conditions. Built for serious enthusiasts and mechanics who run modified engines at the track or push street performance machines to their limits, this formulation delivers the thermal stability and film strength required when boost pressures climb, compression ratios increase, or engine speeds exceed stock parameters. Whether you're tuning a naturally aspirated mill or managing turbo heat soak, TORCO's T-4MXR addresses the viscosity and protection gaps that standard oils cannot bridge.

The 15W40 viscosity grade strikes a critical balance for modified engines: the 15-weight winter rating ensures rapid cold-start flow and bearing protection during initial cranking, while the 40-weight hot rating maintains film thickness under sustained high-temperature operation and high-shear stress. The semi-synthetic base stock resists viscosity breakdown far better than mineral oils, preventing thinning in the heat of competition while delivering anti-wear and anti-oxidation protection that extends oil change intervals even under severe duty. This formulation reduces sludge and varnish buildup—common problems in modified engines where combustion temperatures spike and fuel mixture enrichment occurs—and provides superior detergency to keep ring lands and valve trains clean.

T-4MXR performs exceptionally in turbocharged, supercharged, and high-compression four-stroke applications where conventional mineral oils oxidize rapidly and lose protective film. Mechanics and tuners rely on this oil for engine builds where ring clearances are tightened, valve overlap is aggressive, or fuel octane demands are pushed beyond pump-grade limits. The 12x1-liter case format provides convenient bulk quantity for shops, race teams, or dedicated enthusiasts who service modified engines frequently and demand consistency across multiple refresh cycles. Always verify your engine's manufacturer specifications and your tuning shop's oil requirements before use; TORCO's engineering targets demanding four-stroke platforms where racing-grade protection justifies the investment.