I use Dino oil that works in my motorcycle.
I use Diesel 15w-40 oil.
A couple reasons:
-It's cheap and efficient to change every 5k miles. $12 for 4 quarts.
-It does *not* have friction reducing additives that would damage my wet-clutch in my motorcycle.
-It's available everywhere.
-My car is turbocharged, and supposedly the additives work better for the turbocharged engines.
-It starts with a thicker base weight (15) and so needs less viscosity modifiers to make it thick. A 5w-40 oil will need more, just for example, because the oil starts off at 5w. This is *not* a problem where I live because the temperature never gets low enough that 15w is too thick for cold-starts.
-Did I mention it's cheap? :p
There was some interesting stuff from BobIsTheOilGuy, but I forget where I saw it. It may be listed in the FAQ.
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