2003 Audi A6 3.0L V6 oil pressure light

Asked by Sep 06, 2016 at 09:43 AM about the 2003 Audi A6 3.0

Question type: Maintenance & Repair

We bought a 2003 Audi A6 3.0L V6.  At high RPM's the red engine oil light
comes on -- at idle we're fine.  When we turn the car off and turn it back on,
the light is not on.  We changed the oil/filter with 5W40 synthetic (it had
10W30) and it got a bit better but the light came back on at high RPM's.  So
we got an oil pressure gauge to measure oil pressure.  We took the connector
to the oil switch off (the one above the oil filter) and the red light came on again
anyway, not the yellow sensor light we were expecting.  We're going to buy a
socket to remove the switch and test the oil pressure.  (Do we use a 27mm
socket for removal?)  Anyway, we're thinking it's a sludge problem and we'll
end up having to take off the lower oil pan and clean the pan and the oil
screen.  Should we replace the oil pump as well?  Is there anything else we
can do to see what's wrong or to fix the problem? 

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