Join Date: Jan 2008
Location: Northeast of Dallas TX
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There is no advantage whatsoever in going to a heavier viscosity oil. I believe Toyota's recommendation is TGMO (Toyota Genuine Motor Oil) 0w20 but M1 is an excellent product.
Last time I checked Mobil makes the TGMO to Toyota's specifications.
I would have an extra quart in the car just in case you need to top off.
2008 Base V-6
2008 Limited V-6
Tow Prep Package & front wheel drive (both)