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Old 10-16-2003, 06:33 PM
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Oil Presure. What is "normal"

Hey everyone, well yesterday I decided to change the oil in the merc. Before I was using Penright 20W60 oil, and whever I drove the car the oil presure guage would be showing 45 all the time.
This oil change I purchased some 10W50 oil on special, So I put that in.

I have noticed that when i'm idle at a set of red lights, that the oil presure guage is showing inbetween 30 and 45. I'm probably worrying about nothing, but, is this normal?
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Old 10-16-2003, 07:45 PM
sixto's Avatar
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The key is that it pegs when the engine is above idle such as when you're moving. If it goes below 15psi at idle, check back with the forum.

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Old 10-17-2003, 01:31 AM
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Your pressure is perfectly normal for your vintage of Benz. My 4.5 shows almost exact numbers running 30W dino, ~25 at idle and pegged underway.
Mike Tangas
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Old 10-17-2003, 01:34 AM
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thanks Mike and sixto - you answered my question in another thread. Guess I should read more and post less
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Old 10-17-2003, 02:14 AM
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It is interesting to note that domestic cars loose their idle oil pressure rather quickly as they age. I remember this from years ago.

I had a discussion the other day with a friend who couldn't believe the oil pressure on one of our 10+ year old cars. He insisted that I didn't know that the engine was rebuilt, but in reality Benzes just seem to keep a strong oil pressure through the life of the engines.
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