I just purchased my first diesel (2001 24v) (150mi. )and had a couple of questions. I have a smell of burning oil coming from engine compartment, is this a protective coating that will burn off or a problem? I cannot locate any smoke. Also, is the oil pressure supposed to drop drantically at idle (from about 3/4 up on press. guage while accelerating to about 1/3 up while coasting). Any reccomendations on mileage for 1st oil change? Thanks in advance for any help!!