Question about 1994 GMC Sierra

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Oil leak When the truck is running, the oil leaks badly. In 2 days of normal driving, the oil went from full (5 qts) to below the operating range. When I first noticed the problem, I was driving on the highway and saw a very small amount of smoke that was barely noticeable. I could not tell where it was leaking from, oil was all over the undercarriage. It does not leak when it is not running.

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  • marine121186 Apr 07, 2009

    The oil filter is not loose.

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  • 67 Answers

Check your oil filter make sure it did not come loose

Posted on Apr 07, 2009

  • Nomadd Apr 07, 2009

    that truck may have an oil cooler on it, there are lines that go from near the oil filter to the radiator check them for damage.

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