Gmc Pickup

April 19, 2010 3:21 pm | Car Carpets

What engine oil should I get for an '88 GMC S15 pickup?

The engine has minor oil leaks, probably because it is old and has greater tolerances than newer rigs. Also, the temperature where I live can be as cold as 10°F in winter and as hot as 90°F in summer. I've also noticed there might be a small amount of sludge buildup. The previous owner used 10w30, so that is what I have been using, but what oil would be ideal for my truck? Also should I switch oils between seasons?

I would stick w/ the 10w30, as a lower viscosity might increase your oil leakage. But consider a high mileage brand. A synthetic, which is more expensive, handles wider temperature variations w/o compromising protection. High mileage though is a good option. Castrol makes one that doesn't cost too much.

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