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Hello - I try to help you. As I am from Europe and have asked the same question in Germany BUT for a different Model I got this answer: The lowest oel pressure in idle state is 1,5. It can go to 1 for a split second when idle is rough - but that's it!! Of course driving the car should be 3.

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2011-09-14 09:04:57
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Q: What is the correct fuel pressure for a 1991 Mercedes 500 SL?
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