Quote:
Originally Posted by leathermang
The oil pump is overbilt.... they just did not make a gauge which will show how high it usually runs... if it gets under one bar then one should worry. If it changes pressure FAST.. one should consider the possibility that the screw on oil pressure valve on the back of some of our engines has fallen off.... or given way... before assuming the oil pump is toast..
There are several updates on that oil pressure valve ( suggested rating ,perhaps design )... be sure to check for the latest recommendations before replacing...
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Fluctuating oil pressure can also mean you need to replace the O-rings on the oil filter stem.
I have a VW with a 5 bar oil pressure gauge. That one pegs out on cold starts, too. Cold, thick oil makes a lot of pressure. That's why worn oil seals sometimes blow on cold starts.
I actually think Mercedes' truncated 3-bar scale is clever. The gauge doesn't move around while you're driving at speed and distract you, but it shows you the values you care about.