Originally Posted By: Jaymus
BTW, that Ford doesn't call for 5W-20 does it? I know, I know, I'm not trying to step back into the past, but there's no way I'd run 5W-20 in a twin turbo V6 pushing over 350 horsepower. But, that's because there's no way I could baby a car like that. I'm sure if you drive like a grandma, everything will be ok, and it will never see over 220 horsepower, more than likely, but if I was a guy putting my foot down, letting those turbos spool and RPM wind, I'd have to have a good, hard to shear oil such as GC 0W-30, or M1 0W-40 (which is known to shear but only down to a thick 30 weight).
I mostly agree with you honestly. BUT I have been hearing more stories about vehicles engines not acting happy when owners stray from the factory recommended oils - which is what prompted my earlier question about whether this is a trend people are seeing. That is thinner oils and/or viscosity shearing out of spec quickly.
Granted this is from a dealership mechanic so take with a potential grain of salt. But he was telling me the new Nissan 370Z calls for some 0w-20 or 0w-30 oil (honestly can't remember other than I remember thinking it was WAY thin) and he said people who have tried to use thicker oils end up with head/valve train damage because the engine is designed SO tightly around the thinner oil that parts of the engine don't get lubricated appropriately with thicker oils
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Overall even though it makes a nice chunk of power I am not to worried since my wife primarily drives it and she is not very hard on the throttle at all. Even if it were my car I probably wouldn't worry to much since I figure that it can tow up to 4500lbs and it sounds like Ford has plans to up the power to 400hp+ in the near future with the same engine. So I think they are currently really running it at far less than what it can do and make for hp.