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No absolutley nothing would tell you you had low oil pressure on the 300C Diesel. Just the "Death Rattle" as you put it, or the bloody thing just slowing down as it siezes up. Or smoke from the locked back wheels (If that can happen) ??.
Its just lucky that Oil pump/relief valve failures are probably fairly rare now but if an engine sludges up badly and the oil pressure falls, its too late on the 300C diesel, the damage would be done.
As happened recently when somones engine really sludged up. No warning light I believe. But if there was a warning light it would be a LEVEL warning light and not a pressure.
Done another search and it appears that the Level switch on the Diesel brings the light up (or has done), on HIGH level as well as LOW.
Last edited by jackwalton; 02-17-2013 at 10:25 AM.