I've got a 97 DisI manual. 149K The oil pres light comes on when at idle (750rpm or less) when the vehicle is warm. Currently running 10w-40 Mobil high milage oil. I changed the oil and did my best to clean out the oil pan of sludge w/o removing the oil pan(used a plastic stick and flushed about 3L of oil through the engine to try and move the sludge out. Seemed to make a difference - regardless, got lots of crap out. Anywho - light keeps coming on. Is it probable that the oil pres sensor is too sensitive? I certainly don't want to destroy an engine, but also don't want to spend a fortune chasing a non-problem. Any insight?