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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,224
neither.

Straight 30 weight oil with high ZDDP content is best for initial startup and the first hour of running.

Brad Penn makes an excellent 30 weight oil just for breaking in a motor.
Valvoline VR1 is another good one.
Don't use synthetic for breakin, it's too slippery to seat the rings properly.
Old 04-08-2010, 10:25 AM
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