AMSOIL Break-In Oil is an SAE 30 viscosity grade oil formulated without friction modifiers to allow for quick and
efficient piston ring seating in new and rebuilt high-performance and racing engines. It contains zinc and phosphorus anti-wear
additives to protect cam lobes, lifters and rockers during the critical break-in period when wear rates are highest, while
its increased film strength protects rod and main bearings from damage. AMSOIL Break-In Oil is designed to increase compression,
horsepower and torque for maximum engine performance.
Quickly Seats Rings
The primary goal during engine break-in is to seat the rings against the cylinder wall.
Properly seated rings increase compression, resulting in maximum horsepower; they reduce oil consumption and prevent hot combustion
gases from entering the crankcase. To achieve this, however, the oil must allow the correct level of “controlled wear”
to occur between the cylinder wall/ring interface while maintaining wear protection on other critical engine parts. Insufficient
break-in leaves behind peaks on the cylinder wall that prevent the rings from seating. The deeper valleys, meanwhile, allow
excess oil to collect and burn during combustion, increasing oil consumption. Too much wear results in cylinder glazing due
to peaks “rolling over” into the valleys and preventing oil from collecting and adequately lubricating the cylinder
wall.
