924Board.org

[Porsche96]

HI

I have a few questions. When i first start my 924S the oil pressure is high (4-5) but when the engine reaches its normal temperature the pressure goes down below 1 on gauge and the oil light turns on. This only happens when the engine is idle and RPM is at 750-800. If rpm is at 1000 oil pressure goes to 1 and light turns off. Is the RPM too low for the oil pump to work properly?? I do have normal pressure while driving (2-4), problem is only when idle. What is the normal idle RPM ? Could it be the oil, im using 10w-30

Thank You for your time,

John

[gohim]

Personally I run Valvoline 20-50 Racing.

According to the 924S Owner's Manual, 10-30 is only recommended for areas where the maximum outside temperature is 70 degress F, or less. That would probably mean that the oil you are using is too thin.

Where are you, and what is the outside max temp?

You may very well have another problem. I would guess that you are due to replace the oil pressure relief valve. Most of the 924S cars got the older 3-piece part that Porsche recommends replacing with the improved single piece design. I heard that the new part costs around $250-$300.

OF course you could just have a malfunctioning oil pressure sender. I recommend changing your oil, then checking the pressure with an independent oil pressure gauge to verify the operation of you dash instrument, and the replacement of the oil pressure relief valve if the correct operation of the gauge is verified.

Do not continue to drive your car in the condition that you describe. You could do permanent damage to the engine.


[ This Message was edited by: gohim on 2002-10-05 06:57 ]

[Porschephile]

I use Mobil 1 15w50. I have had no problems with oil pressure. I asked a Porsche factory technician, and he said that on a car as old as the 924S, you shouldn't use anything less than 15w50. he said to use it year round. so I am gonna do that...I like the way the mobil 1 keeps the engine.

[baker87]

Use 40 weight oil for a while just for temporary use. Gohim was right about the sender. I had the same problem before I rebuilt the engine. I put a new oil pump, sending unit and pickup tube in the engine. THis seemed to fix my problem. Baker87