VP 10W-40 Engine Break-in Oil is a unique, multi-viscosity oil, formulated with a blend of high-quality conventional base stocks, ZDDP, Moly, and other additive chemistries. It allows newly machined engines to properly finish seating, and allows mating of machine engine parts. The engine break-in process is extremely critical when putting together an engine.
Use VP Engine Assembly Lube for your engine rebuilds. It provides superior protection against scuffing, galling and metal transfer during engine assembly and the critical break-in process.