04-13-2014, 12:44 AM
Seems to like everyone after swapping to 10w40 has the rattle which is to thick of oil for the relief valve. When you swap back you got to remember after changing O/F there is still about a quart left in the motor. Not sure about now but I would still think do but new motors always come with beak in oil meaning it has ZINK in the oil helps break in motor and seat the rings it's very hard to find oil with ZINK now. I'm going to run my oil for atleast 1,000 miles due to getting my rings seated ! But that's just me I'm not telling anyone else to do it. If you ever rebuilt a motor of any kind jack roush sells break in oil but it's very high ( nascar) but you need ZINK in a new motor
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