I use Mobil-1 5w30 and I change every 3000 miles. I have a new build as well and I hanged it after the first 500 then after the first 1000. Probably overkill but it seemed to be good for my motor. I have strong pressure and when I change the oil the viscosity seems to hold up pretty well. Im not a mechanic or well experienced like some of these guys but personally its what has worked for me.
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1994 Z28 M6
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