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Oil light comes on when above 2000 rpms

(1995 Audi 90 Quattro)
in Mesa, AZ on January 30, 2011
i need to know if it might be sensor and where is it. oil gauge still reads good pressure oil light sending unit?
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Popular Answer
on January 30, 2011
oil is not going back to the sump fast enough, change the oil and filter using the correct grade for your car and must syntetic.
on February 04, 2011
changed oil to 15w-40 royal purple with KnN oil filter took for drive light did not come on. Got home looked under the car and was puddle of oil. oil pressure switch that controls light was leaking. the one on car had yellow insulation on bought new one it was brown. Installed new one now light and beeper have returned. If I got dirt in sensor putting in would that cause this or what else could be the problem? please help
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