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Everything posted by Towel Rail
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If the rings are no longer sealing well, I could see a gross overfill causing excessive oil consumption and thus plug fouling. Just set up a drain pan, unscrew the plug *almost* all the way, and let it strickle out for a few seconds. Screw in the plug a couple turns, check the oil level again, and repeat as necessary. - Scott
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5W40 and 5W50 oils, for the most part, use Group III/IV basestocks, so they need some, but not a lot of VIIs. The Castrol 5W50 is more like a "strong" 5W40, just 0.1 cSt over the line. Kind of a poseur, lol. I think those wear numbers are in percentages. PPM would be somethng like 26 for Iron, 19 for Copper, etc.
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A far safer plan would be to simply use narrower tires. That reduces the rolling resistance and unsprung weight without having to do stupid things like inflating the tires over the MAX sidewall rating. My recommendations for overall economy are to lose weight (passenger(s) and cargo), keep the car in tune, and drive slower.