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Oil Temperatue Gauge

Engine

Vehicle Information: Year: 1988; Engine (Size, Modifications): 3.3 L; Total Mileage: 76,800;

I have a 1988 930 Turbo coupe with 76,800. A full and complete 15,000 maintainence done at 74,300. My is that: I have notice that my oil gauge (2nd over from the left) does not go up to the 10-11 o'clock position (it now stays initially in the "red" zone) when I start the car when it is cold like he has in my past 4 years of owning the car. I would have to drive the car for about 15-20 minutes before it reaches this mark. I do know to check the oil level when the car is at operating temperature and check it level ground/pavement. The level at the dipstick is well withing the "low and high" marks which is what I have gauged by in the past to be correct. If it drops to the low mark, I add about three-quarter to full quart of mobil 1 (15-50).Thus I know that I am not low on oil and at this time of operating temperature and checking at the dipstick correlate with the gauge (now up to 10-11 o'clock position). Is is it the float, oil sender unit, some loose wiring and/or gauge that is malfunctioning. Being the "anal" 911 owners that we are, anything not "normal" throws my OCD (obsessive compulsive disorder) out of whack.Like I said, I mainly go by the level of the Dipstick reading, but it would be nice to get this recent quirk cleared.I appreciate you advise in the past and look forward to hearing back from you.Victor.

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