Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Piranha300, Apr 1, 2002.
I know the manual says you can run 15-40 but Mobil doesnt make that weight.
There's really no reason to run oil that thick in an engine unless it's a Diesel. If it's worn out and burns oil, sure, run thicker oil, but obviously you wouldn't run synthetic if you were burning it off.
I was just thinking about more protection in the summer heat. My engine has 170,000 miles on it but it doesnt burn oil or knock.
I am running 20W-50 in my Jimmy right now. I run it in the AZ summers. I haven't run it very long yet. I just started running it on suggestion by DesertDueler. I listened to all the arguements on running heavy oil, but in the AZ heat, I figured that 20W-50 wouldn't be bad for the motor at all, and might last longer between changes. Right now I change oil about every 2K in the summer with 10W-30. Maybe I will get 2.5K now.
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