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1979 GMC Sierra hwy oil usage

Tiny
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  • 1979 GMC SIERRA
In city driving my PU truck uses no oil, but in hwy. Driving it uses lots. Don't think it's burning it. Could I have bad gasket somewhere?
Friday, June 6th, 2014 AT 6:45 AM

5 Replies

Tiny
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  • MECHANIC
  • 20,761 POSTS
If you don't think it is burning it, then where do you think it is going. It either leaks or it gets burned so, do you see any leaks?
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Friday, June 6th, 2014 AT 7:16 AM
Tiny
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Yes, but can't tell where it's leaking from, sprayed all over lower part of engine. I'll try tightening oil pan bolts.
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Friday, June 6th, 2014 AT 12:35 PM
Tiny
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You have to completely clean the engine and then run it to see the source of the leak.
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Friday, June 6th, 2014 AT 1:03 PM
Tiny
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Thnx. I'll try it after tightening bolts. My main? Was why does it leak only on the hwy. More pressure at high speeds?
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Friday, June 6th, 2014 AT 1:11 PM
Tiny
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It probably leaks around town too, just not as much.
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Friday, June 6th, 2014 AT 2:24 PM

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