Posted: 10/17/2013 9:40:53 AM EDT
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How effective are motor oil additives?
I'm trying to clean a sticky valve, and I have gotten a lot of suggestions (some on here, some elsewhere) on different additives to try, but I want to pick the right one, so what works the best? Seafoam? Marvel's Mystery Oil? A quart of ATF in the crankcase? Something else? Will mixing more than one additive together hurt anything? Is it possible that any of the additives could hurt the engine? Can the oil be thinned TO MUCH? What wait oil should I use. According to my manual I should use 5w30 most of the time, and 10w30 if I'm expecting the temperature to be over 100 degrees, but how will the additives effect things, should I switch to a different weight motor oil? Will the additives effect any detergents that might already be in the oil (high millage oil)? The manual says my oil capacity is 4.5 quarts, is that counting the oil in the filter? Is my real capacity actually about 5 quarts? My oil is already max filled, should some be drained prior to adding the additive? Should the additive be added before, or after my next oil change (do very soon)? When I first got the car less than 300 miles ago it had near clear oil, now it's already near black, could an additive already have been added?, could adding more, or adding to dirty oil cause a problem? How long after using the additive should I wait before an oil change? |