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Q: 1988 mercury grand marquis oil light came on. on 1990 Mercury Grand Marquis

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What could make an oil light come on when oil level is reading good
(1) Answer
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The oil pressure warning light is designed to come on when oil pressure dips below 3 to 7 psi. At that stage damage is being done to the engine so if it has been on for a while it is most likely a defective oil pressure switch which is probably less than $15 in parts and take a half hour to fit.