5W40 Motor Oil 1 Gallon

Redline OIL 5W40 Motor Oil 1 Gallon (SKU RED15405) is a premium synthetic motor oil engineered for high-performance engines that demand superior protection under extreme operating conditions. This full synthetic formulation is designed for drivers and mechanics who refuse to compromise on engine reliability, whether running vintage muscle cars, modern turbocharged platforms, or heavy-duty powerplants. The 5W40 viscosity rating ensures optimal flow at cold startup while maintaining robust film strength at sustained high temperatures.

The Redline OIL formulation features elevated zinc (ZDDP) anti-wear additives that significantly exceed API SN and SM requirements, providing critical camshaft and valve train protection—especially important for flat-tappet cam engines and high-RPM applications where boundary lubrication is essential. Synthetic base stocks deliver exceptional oxidation stability and thermal breakdown resistance, extending drain intervals and reducing sludge and varnish formation. The 5W cold-flow characteristic guarantees rapid circulation during winter starts, while the 40-weight hot viscosity maintains a protective boundary layer at sustained elevated temperatures, preventing premature wear on precision bearing surfaces.

Classic car enthusiasts, drag racers, and performance engine builders trust Redline OIL for its track-proven zinc content and anti-shear properties. The 1-gallon jug format (weighing 7.8 lbs) is ideal for top-offs between full service intervals or as a baseline quantity for smaller-displacement engines. Verify your engine manufacturer's oil specification and viscosity requirements before purchase; this synthetic 5W40 is compatible with most domestic and import gasoline engines designed to accept 5W40-rated oils, though always consult your service manual for definitive compatibility.