difference in oils?
Thread Starter
Joined: Jun 2005
Posts: 1,245
Likes: 8
From: Fairfield, CA
Car: 91camaro rs,2014 silverado 5.3L
Engine: 5.7Lcarb,5.3L
Transmission: 700-r4, 6L80
Axle/Gears: strange 3.73's
difference in oils?
what is the difference it 10w-30 and 10w-40? i read in a different thread that if u run ur car hard use 10w-40. will that last longer against oil burnoff?
Junior Member
Joined: May 2003
Posts: 90
Likes: 0
From: Overland Park in the Great State of KANSAS
Car: 91 Z28
Engine: 468 ci
Transmission: thm 350
When I went to General Motors Training Center back in the 70s, they said NEVER use a 10W-40 because it would thicken up and cause all kinds of problems. If you are going to run a synthetic, 10W-40 would be OK. I run AMSOIL 0W-30 now but I'm going to switch to a 0W-20 for better performance and gas millage.
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