My '95 was doing exactly the same thing, only I think a little worse. I say this because I got the oil light to turn on, and then the my tappets started clanging. I took it to a mechanic who cleaned all the sludge out, removed the sieve and tube and cleaned it too, and he also cleaned what he referred to as the veins in the engine. We put oil designed for diesel engines with the idea that we would leave it in there a couple of weeks and then change it again to complete the cleaning. After about a month that oil is still clean and the light has not been back on again. (Knock on wood).
A couple of mechanics told me that using diesel-spec oil was the same as using gasoline-spec oil and an additive, that they actually recommended the diesel-spec. You may want to give this a try to see if it helps.
By the way, they checked for oil pump operation by removing the oil filter, starting the engine for an instant to see if oil was pumped through, and when it did, they concluded that sludge was clogging the sieve and that the oil pump was still operational. So far it seems to have been the correct diagnosis. (Again, knock on wood).
Hope this helps.
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