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Just use a full synthetic and don't worry about the oil weigh. 0w20, 5w20, 0w30, 5w30, 10w30, 0w40, 5w40, 10w40...... all will work well and have worked great for me. I've even run 15w50 during our northeast cold winter.
5w30 and 10w30 are the same viscosity range at normal running temp. 30 falls between 9.3-12.5cst at 100c.
5w is tested at -30c(cranking) and -35c(pumping)
10w is tested at -25c and -30c...
25w is test at -10c and -15c
How cold does it get where you live?
If you don't live in the Santa household, quit worrying.
Because the 1997-2001 engines are sludge monsters(caused by cooking oil), I recommend that you use a full synthetic, check the oil every 500 miles, top off as needed, and keep the oil change interval reasonable. As long as the oil is full synthetic, I could care less what your oil weight is or what the owners manual recommends.
From Mobil1's website:
5w30 is 11.1cst
10w30 is 10.7cst
Higher number is thicker so which is???
And even more extreme, Castrol syntec:
0w30 is 12.1cst
10w30 is 10.1cst
Again, which is thicker?