Generally for every 1000 RPM you should have 10 PSI oil pressure. Before I would get alarmed, I would replace the oil switch for you gauge as these can give you a false low reading when they are old.
The exact number isn't as important as how much the pressure gauge fluctuates. Watch the gauge when the engine is first started. It should go up somewhere near the middle. That's the point at which the pressure bypass engages. Then watch the oil pressure after the engine warms up. If the oil pressure drops significantly AT AN IDLE when the engine is warm, you have worn main and/or rod bearings... but WORN doesn't mean WORN OUT. If the engine is still able to maintain oil pressure, even though it drops a little when warm, you can raise the oil pressure by changing to a heavier (thicker) grade oil. If you've been using 5W15, change to 10W30 or even 15W40. You'll be surprised at how much of a difference that can make.
The engine will:Not warm up at all, This should set a code on the computerWill warm up very slowly, This should set a codeWill only warm up to a lower temperature than it should, this may not set a codeThe engine may warm up properly but continue to warm up until it overheatsThe engine may warm up until it is either at the correct temperature or too hot then cool down until it is too cold and repeat the cycle.All of these are symptoms of a bad thermostat.
The pressure is always lowest at the frontal boundary, whether warm or cold. ______________________________________________________________________ The pressure would decrease since warm fronts are found at the front of low pressure systems. Pressure can also decrease at the warm and cold frontal boundaries just like the previous answer states, but can only increase when the cold front passes.
Diagnostic error code number 118 with high temperature input on a Audi A4 means that the engine coolant is not running at the right temperature. When the engine is cold, it should be warm, and when the engine is warm, the temperature should be cooler in the engine. The problem could be with the Engine Coolant Temperature sensor or the vehicle could be low on fluid.
From the moment you turn on the vehicle, it changes in two ways: 1. When it is cold and the oil is cold and thicker, it needs more pressure to pump the oil through the engine. You will notice a change in the oil pressure at idle when it is cold and at idle after the engine has had a chance to warm up. 2. The higher RPM the engine has to operate in (such as going through speeds 1, 2, 3, OD, or flooring it to pass someone), the more lubrication the engine will need and thus the higher the oil pressure. As soon as the engine slows down, so the oil pressure lowers.
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