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When putting in a new 305 engine is it good to used 15w-40 royal purple for the first 500 miles or well it hurt the engine anyway?
1bad84pu
Synthetics are to good at lubricating and should be used after the rings have properly seated. So run a good non-synthetic the Castrol GTX.
Royal Purples advice on the subject is as follows.
Taken from http://www.royalpurple.com/prodsa/rpmoa.html
"Royal Purple's motor oils are API certified and will not void new car warranties. Royal Purple recommends waiting until the manufacturer's first scheduled oil change or a minimum of 2,000 miles in new gasoline engines before using Royal Purple. Allow 8,000 to 10,000 miles before use in diesel engines."
Next why 15W-40 that engine if Gasoline it calls for a 5W-30 or 10W-30.
A lower weight oil like 5W-30 would get you better gas mileage.
I can see 15W-40 as the mileage on the engine gets up there or it was a Diesel.
Hope This Helps.
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∙ 16y ago
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