Oil level has been within range on the dipstick.

LUVMB: What else should I check besides the tube? It's clear and the elbow coming out of the valve cover is clear. Not sure what else to check.

Thanks,
Bill

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'87 300SDL, intensely modified Greasecar setup, with nickle plated heat exchanger, 3 valve setup, 312,000 miles
'95 Suburban diesel, Greasecar basics, 16 plate heat exchanger, mercedes fuel lines, Racor filter
'85 Renault Alliance converted full electric vehicle