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Guest
Anonymous Poster
Dec 14, 2008, 3:08 PM
Post #1 of 2
(2285 views)
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03 Grand Prix with the 3.8 motor. Why does the manual call for 10w-30 oil when almost all other newer GM products (including the HD trucks) call for 5w-30? I live in the Minneapolis, MN area.
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Loren Champlain Sr
Veteran
/ Moderator
Dec 14, 2008, 3:34 PM
Post #2 of 2
(2280 views)
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Re: 10w-30 vs 5w-30
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A lot of the newer vehicles call for 5W30 for fuel economy reasons. IMHO, 10W30 gives the engine a bit better protection, as I feel that the 5W is so 'thin', but, I'm a dinosaur. Since you live in the midwest, you may want to run the thinner stuff so that your engine will turn over when it's minus 20F? Every new car/truck I've had, since '92 has 'called' for 5W30, but have run 10w30 in all of them.
Loren
SW Washington
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