Question about 1993 Buick Century

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Oil light The oil light came on and stills stays on even after adding oil to the full mark. Is the the oil pump bad or is there something wrong?

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  • rgoranson May 28, 2009

    There 167,000 miles on the car.

  • Samuel Charles Spriggs May 11, 2010

    How many miles on the engine?



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The oil light typically only shows a lack of oil pressure, not a low oil level. Granted, if the oil level is so low that the pump is losing the ability to pick it up, it could activate then since the low pressure situation would be caused by an extreme lack of oil. Also, when was the last time the oil was changed? A clogged oil filter or severely dirty oil could cause an oil pressure drop.

It could be an oil pump failing, or it could also be a bad sending unit (the part that sends oil pressure data to the instrument cluster). Changing a sending unit or disconnecting it and hooking a pressure gauge to the port is usually easier than pulling the oil pan to replace the pump. If it were me, I would start there and make sure it wasn't a false alarm.

Hope this helps, and good luck!

Posted on May 28, 2009

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Have the oil pressure checked with a mechanical test gauge, if it checks ok then replace the oil light sending unit.

Posted on May 28, 2009


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