Quote:
Originally Posted by JFP in PA
Knowing this will start an argument; 0W-40 Mobil 1 is too thin at 68F, much less 104F. Move to an ACEA A3/B3/B4 rated 10W-40 such as Castrol Syntec (recently renamed “Castrol Edge with Syntec Technology).
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By going to 10W-40 all you have done is raised the viscosity of the oil at start- up. No change has been made to the viscosity of the oil at engine operating temp where you might want a heavier oil. So if 0W-40 is too thin so is the 10W-40 at engine op temp. The article that racer suggests is good reading and there are many others that go into oil viscosity in more depth. Lot more to it than just the oil weight.