Editing How to prep and start a rebuilt engine (section)
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===Break in oil=== Use a good quality 30w for break in along with an additive made specially for break in like ZDDPlus. There are also good break in oils available that already contain the right amounts of additives. ;30w break in oil *Amzoil *Brad Penn/Howards Cams *Lucas *Edelbrock There are also multigrade break in oils. Royal Purple and Comp Cams' break in oil is 10w-30. Joe Gibbs break in oil is heaver (15w-50), but still a multigrade. I'm sure there are others. Plus there are those who use over the counter multigrade motor oil w/ZDDPlus, etc. added. At the end of the day it's more important to build the engine right and set it up to fire up immediately after priming the oiling system than to worry ''too'' much about the viscosity. But there are not many who will recommend using too thin of a viscosity, like 10w-30/15w-40 for break in.
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