Quote:
Originally Posted by Devant
YES break in oil. It is used more for smooth cam break in but also has benefits for rod bearings.
Break in oil is a single weight oil that does not change viscosity with heat, it also contains zinc which allows new metal parts to crunch on the zinc rather than the metal parts themseleves.
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For cams, there is metal on metal. It is not in the bearings, but in the lobes on the lifters. Break in oil or at least a break in process or ZDDP additive is necessary.
My research suggests there is no break in for bearings and thus no need for break in oil. I am not using any after changing my rod bearings and I have not read of anyone else doing so, either.
Also, there are multiweight break in oils if you do choose to use one. Even for a real engine break in, it is not necessary, however. The last engine I broke in was on Walmart 10W30 with a bottle of Redline break in additive containing ZDDP.