I’ll start with a description of normal oil pressure readings from Clark’s Garage Shop Manual:
“The 944’s oil pressure should run 4-5 bar at idle when the engine is cold. It will gradually decrease to 2-3 bar at idle as the engine oil warms to normal operating temperature. Once the oil is at normal operating temperature, the oil pressure should indicate around 4 bar at 5,000 rpm. It takes the oil longer to reach its normal operating temperature than the coolant. Therefore, don’t be surprised if oil pressure continues to decline after the coolant temperature has stabilized at its normal operating temperature. Occasionally, you may see your oil pressure drop to less than 2 bar. This may happen on very hot days when the car has been driven particularly hard. You should be extremely concerned if the oil pressure dropped to less than 1 bar. This is indicative of an problem with the oil pressure indication or the oiling system itself. Under these circumstances, the car should not be driven until the cause of the low oil pressure indication is determined and corrected.”
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http://www.clarks-garage.com/shop-manual/lube-03.htm
The oil pressure on your gauge is indicated in bars of pressure; each bar is about 15 psi. When the needle is pointing at the 2 mark, it is indicating about 30 psi, which is adequate to protect the main bearings and the rod bearings in your engine at idle.
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If you want to have the gauge show a slightly higher reading, then use the heaviest weight of oil that Porsche recommended for your car, namely 20W50 or 15W50 oils. Note that your fuel mileage might suffer a bit due to the increased viscosity.
Another possible solution to your concern is a complete rebuild of the engine, focusing on the main bearings and the rod bearings. Over the years, the clearance in the bearings has increased, resulting in lower oil pressure readings. Decreasing that clearance in the bearings will result in slightly higher oil pressure readings. Whether or not you are willing to spend the time and the money on that type of solution is up to you.
George Beuselinck, 924/944/968 Expert, PCA National Tech Committee
Source: https://t-tees.com
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