Quote:
Originally Posted by pbonsalb
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.
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Everything I've ever read from legit sources say rod bearings don't need a break in oil, but they do need a break in period where you don't drive the car hard.