W107 500SL Phantom Low Oil Warning

My 88 500SL has recently started giving a Low Oil Level warning, usually after 20 minutes of motorway driving, but when checking the oil level, it's perfect! The oil and filter are less than 500 miles old, so my question is could there be a blockage in the oilways somewhere causing the sump to run dry. Has anybody else had this problem? Many thanks.

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