Quote:
Originally Posted by TK87
I'd stick with 5W20. Manufacturers recommend a certain weight oil for a reason. Todays engines are built with such tight clearances that 30W in this engine may not get to all the places it needs to be due to it being thicker than the 20W. Better safe than sorry if it ever came down to an engine warranty claim.
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The whole "tight tolerances" of today's new engines is a myth. What, there weren't tight tolerances before? You know, piston rings, valve guides, valves seats, machined parts. So, they all had loose tolerances in the past? No hardly.
IMO, 5w-20 offers marginal lubrication and wear protection under high temp and high load conditions.
Ask yourself why 5w-20 isn't recommened anywhere but in the US market. Answer: It's being forced on US car owners in order to conserve fuel, nominally. It's not worth it. Not worth the inferior protection it provides your car engine.
