10w40 Petroleum Oil 1Qt

Lucas Oil 10W40 Petroleum Oil in a 1-quart bottle is a conventional mineral-based motor oil engineered for hot rods, classic cars, and high-performance marine engines operating in demanding conditions. The 10W40 viscosity rating provides reliable cold-start flow in winter months while maintaining stable film strength at elevated operating temperatures—critical for engines that see both full-throttle acceleration and sustained cruising loads.

This formulation includes elevated zinc and phosphorus content—a legacy specification originally designed for flat-tappet camshaft engines common in vintage and modified powerplants where anti-wear protection is non-negotiable. The conventional base stock resists shearing, meaning the oil maintains its viscosity grade longer under the stress of sustained high-RPM operation typical of hot rod applications. The 1-quart size accommodates both top-off service and full oil-change intervals on smaller displacement engines or as a readily portable field reserve for extended outings.

Boaters running vintage inboard engines, weekend fishermen maintaining older outboard motors, and classic car enthusiasts appreciate Lucas Oil's track record in applications where modern low-zinc synthetic specs either don't apply or actively harm engine longevity. This product addresses the specific lubrication profile those engines require—not a compromise formula, but a purposefully formulated oil for that exact duty cycle.

Each bottle is sealed and ready to pour. Store in a cool, dry location away from direct sunlight to preserve viscosity integrity. Always verify your engine manufacturer's specifications before switching oil grades or formulations.