QuestionThe oil level gauge on my 1980 300cd registers full when I first start the car and when my foot is on the gas, but when idling the level drops to about half. Is this symptomatic of anything other than a low oil level? I suspect the drain plug is leaking, but I am confused by the conflicting readouts of the gauge.
AnswerAnswer:
I do not recall the 1980 300CD as having an oil level gauge, there was an oil pressure gauge, and what you describe would be normal function.
I do not trust any oil level gauge.
In the morning (engine cold), check the oil with your dip stick, if the level is OK, ignore the level gauge.