Quote:
Originally Posted by 0w40X1
One can open oil cap, and get very good idea of color of oil.
Oil can stay in engine for years without hurting anything, but don't tell your dealer. Read BITOG.com for lots more oil info and Used oil analysis.
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I did a quick read, and he says that over an "extended time" whatever that is, it will thicken, even synthetic.
https://bobistheoilguy.com/motor-oil-102/