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-   -   Oil Pressure on S500 (http://www.peachparts.com/shopforum/tech-help/8721-oil-pressure-s500.html)

Glen Willcoxon 08-01-2000 03:05 PM

I have a 1994 S500 coupe with 56000 miles that is showing low oil pressure when it warms up. The oil pressure starts out cold at 3 bar, but when the temperature gets to 95C it shows about .5 bar at idle. The pressure stays at 3 bar when cruising down the road at 2000rpm. What do I need to do, if anything?

[This message has been edited by Glen Willcoxon (edited 08-01-2000).]

Steve Wengel 08-01-2000 04:33 PM

Glen,
I suspect this is quite normal for your engine. I have a '93 400E which does exactly the same thing. The owner's manual even says that as long as the pressure is at least .3 bar at idle, and rapidly comes up to 3 bar when under load, this is within normal limits. On mine, in the summer, pressure is a little under 3 bar when running at 55 mph on level ground and about 1800 rpm, but pegs the needle when I apply even a little throttle.



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'93 400E

jeffsr 08-01-2000 05:56 PM

Do nothing, this is fine. Change it frequently.

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Jeff Lawrence
1987 300e
1989 300e
2000 Dodge Grand Caravan SE

Glen Willcoxon 08-01-2000 09:08 PM

Thanks for the information, I just purchased the car and I am going over it with a fine tooth comb. The oil pressure is the only thing that had me concerned, I am planning to use Castrol GTX 20W50 for the oil. Do you have a recommendation, or a reason for not using Castrol?? I have used it in all my other cars. 82 Porsche 911, 87 BMW 635, 89 BMW 325IC, 94 BMW 530, and 95 BMW 325IC with out any problems.

jeffsr 08-01-2000 09:10 PM

Great stuff. Good weight for your neck of the woods. Change it every 3,000 and you'll be a happy guy.

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Jeff Lawrence
1987 300e
1989 300e
2000 Dodge Grand Caravan SE

420SEL 08-01-2000 09:19 PM

Castrol GTX is excellent oil. Unless you live in a very hot climate you might want to try a 10W40. 20W50 seems a little thick. I live in Canada and use 5W30 year round. Its great stuff.


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Jason Priest
1986 420SEL


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