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I should add, to be exact, that 5w-30 oil is allowed in my 1992 toyota motors when the air temperature is BELOW 50 F. I do 5-30 from december to march usually. A long time ago, I forgot to change to 10-30 in one of my cars, but was reminded to do so because when the weather got hot, the motor was much noiser, it had a nasty sort of clatter. Putting 10-30 in made it quiet again.
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