Have to say that the symptoms you describe are classically expensive as they suggest you are only maintaining oil pressure when the oil is thigh and sludgy - which generally means one of three things, big ends, small ends or oil pump - all painful.
As suggested, try a good flush and clean then use thicker oil, hopefully that will stop the light coming on ( though it won't have solved the root cause).
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Currently XC60
Previously XC60, V70, S40, ...
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