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break in oils

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07-15-2007, 03:55 AM

P.J.

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Join Date: May 2004

Location: Ontario Canada

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Re: break in oils

What about the hd 30 oil for the first 3000 miles
I know that adding the GM additive OAS helps too??.
Is HD 30 oil ok for the brake in period. I dont want to use 10 w 30 as some people have recommended. The 427 425 hp motor
I think needs a heavier oil.
PJ

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