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Break in oil for stock 7.4 330-350??

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Break in oil for stock 7.4 330-350??

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Old 04-10-2002, 10:36 PM
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Default Break in oil for stock 7.4 330-350??

I know I am opening a can of worms but what weight natural oil for the new motor??
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Old 04-10-2002, 11:47 PM
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i have heard teh best way to break ina new motor is with light weight valve springs or even a set of old lower ratio rocker arms
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Old 04-11-2002, 08:35 PM
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30 wht. non det. petrolium oil. Break in cam dump oil Refill with same. Run to operating temp and cool completely for about 6 times. This is to allow (work hardening) to pistons which will harden the soft alu of the piston and become harder than before and scrub the rings to the cyl. After that you can go to a better oil
(syn, or petrolium) and hammer down. Good luck. GEO
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