Quote:
Originally Posted by Racer Louis
Switching from the F10 approved oils (which range from 0W-30 to 0W-40 and includes 5W-30 & 5W-40) to the previous M5s from the E39 (and E9x M3s) 10W-60 will likely cause long term problems, typically including premature main and rod bearing wear. Using a heavier oil (even though "viscosity" isn't just a thickness measurement but a temperature range measurement as well) will result in higher oil pressure but more importantly SLOWER oil flow in the engine. This will generally result in less lubrication in high force locations, like bearings, and higher operating temperatures at those points.
If it were my car I wouldn't use the 10W-60!
In addition, if you want a car that doesn't use oil (mostly blow-by past the piston rings) you'd be better off with a Lexus. If you want a high performance motor you don't want the ring to cylinder wall clearance tight enough to prevent blow-by as it just results in more friction & heat.
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Exceptionally well said. I agree with every word.