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2003 GMC Sierra 2500

Question: Burning too much gas after oil change

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Visitor, Port Huron, MI, February 21, 2011, 20:21

I was getting 800 KM. per tank before oil change now getting 600Km.

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, February 21, 2011, 20:26
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    Oil should not drastically effect MPG unless a really thick viscosity of oil was used. It may be coincidental or during the oil change something got inadvertently knocked off or damaged. A professional grade scan tool may show valid diagnostic information like fuel trim figures that would help diagnose what is wrong.

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