Originally Posted By: Benzadmiral
My owner's manual says 10w30 as the preferred grade unless temps get chilly, then to go with 5w30, or 0w30 if it's really cold. (Not sure of the exact temp cutoffs for those.)
But the oil filler cap says 5w30.
I plan to use 0w30 all year. It has been hot as heck here in Illinois. When the engine is hot, 0/5/10W-30 all are at virtually the same viscosity. Remember, oil is thicker when cold than hot.
In fact, sometimes 0w30 is slightly thicker when hot than 5/10W-30. It is definitely thinner when cold. Both of those made my decision to use 0w30 all year an easy one.