Quote:
Originally Posted by JFP in PA
5W-50 is good, but the 10W-40 Syntec is better............
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Just curious, JFP: what is your basis for Castrol 10w-40 over 5w-50?
Is it because the "spread" is higher with 5w50 thus the 5w-50 requires higher change intervals over the 10w-40?
Or are you stating this because of formula/experience/analysis reasons?
Thanks as always for picking your brain.