On my r reg 300tdi , after a while the oil light comes on at tick over (750rpm) , it goes off at just over 1000rpm , the oil is up to the max on the dip stick , any ideas , or is it just one of those things.
been lots of threads on this problem. 90% cured by replacing pressure switch as already suggested. Cheap and easy to do. very good point also about age of oil,