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Probably has more to do with mods than anything.......but the car was designed for using a 1060 with a vis @ 100c of around 21 wheras a 0w40 is in the high 12's to low 14's (except redline which is 15.6 and what I'm considering switching to). That's a helluva difference there. And if a large drop in viscosity does/could cause lifter bleed off you'd expect it to happen in that rpm range. I have no idea what effect that'd have on the powerband though and it's really pointless to speculate without a before dyno on 1060.
Last edited by Doc Oc; 09-22-2015 at 12:24 PM..
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