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thats right
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2,197 Posts
they are both the exact same at higher temps :read:

hence the -30w :crazy:

the difference is in their viscosity at startup. GM says to use 5w-30 so i would use that. once you are warmed up they will behave the same pretty much
 

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4,590 Posts
Yea Jeff hit it on the head.

The # before the W is the cold weight the number after is the operating temp weight.

I use 5w30 b/c that is what the manual says. Alot run 10w30 whitch is fine as long as you are not in a cold environment where the 10 would be to thick as startup to protect like it should.
 
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