Break-in Oils Archives - UnderhoodService
JEGS Engine Break-In Oil Available In 10W30 And 20W50

JEGS Break-In Oil is fully formulated and does not require the use of any other chemical additives. Available in one quart containers.

Assembly Lubes And Break-In Oils

Perhaps the most important property of lube oil is its ability to remove heat from a surface where two or more metals are sliding across each other. In much the same way as air flows around cylinder head fins to remove heat, oil flows through a bearing and removes the heat caused by friction. I can’t imagine the destruction which would follow from assembling an engine completely dry.