240d. noticed the other day at engine idle the oil pressure guage was pulsating, i.e. was moving around the two bar mark at 2 - 4 hz rate my guess 5 psi or so. this phenonenon lasted the better part of the day and then suddenly stopped. what could possible cause such an occurance?

I think its normal, nothing to worry about.

__________________
2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
-------------------------------------
'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold

In hot weather, the oil pressure gauge on my 300SD would sometimes pulsate as you mentioned. What grade of oil do you run in your car? I always use 10W-40 petroleum based in my cars.

__________________
Regards,
Aaron

aaron, the 83 is a replacement for a 79 that i lost. that was stinky. seriously, the temperature here yesterday was 40 -45 degrees f. driven mb diesels now about 50k miles. never saw this pulsating before. as new purchase, i changed oil and filter. used the usual 15w -40 dino rotella. (fuel filters and valve adjust for completeness of proceedures done by me).

Fixed many pulsating pressure gauges with new o-rings on the end of oil filter housing top piece (small o-rings). Try it and see if this helps.

__________________
euro 287
Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck

my whole car (240D) pulsates

__________________
Jim