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Old 01-10-2003, 04:56 PM
Registered User
Join Date: Jan 2003
Location: Macedonia
Posts: 61
Question How to increase the compression on a S 350

Hi there guys. The indicator of the oil pressure on the dashboard stays at about 1.8 when teh working temp has been reached, and of course 3.0 when the engine is cold. Can anyone tell me how to increase the pressure, with minimum expenses. Should I use any additives. Thanks
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Old 01-10-2003, 05:22 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
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As long as the oil pressure goes upto 3(bar) when the engine is at 2000 RPM, your engine is OK!
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Old 01-10-2003, 05:55 PM
Join Date: Dec 2001
Location: Southern California, U.S.A.
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By the way, welcome to the forum!

This is the first time I've seen someone post from Macedonia.

How are things in your part of the world?
Paul S.

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79,200 miles.

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Old 01-10-2003, 11:20 PM
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Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 358
Sounds like your oil pressure is okay. However, to answer your question ... My father-in-law's Peugeot low pressure light would come on at idle because the bearings were worn. I changed his oil and put in straight 50W with a bottle of STP. He drove it for several more years until it got to ugly to drive.
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Old 01-11-2003, 02:36 AM
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Join Date: Jan 2003
Location: Macedonia
Posts: 61

Thanks guys, thanks to all of you. I really appreciate it. At 2000rpm the pressure is 3 bar. But I have seen some other cars, like on the S 300 TD('96-'98) and the pressure is 3 bar all the time. But I will probably have to change the bearings, can someone explain what bearings are, because I'm not really familliar with that word. As far as Macedonia things over here are pretty good, thanks God, but right now it is pretty cold and when the snow falls, that is no time to take your Mercedes out, it is really slippery and the roads are not as wide as they are in the US, not even close, so you have to really think twice about going out.
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Old 01-13-2003, 03:04 PM
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Join Date: Jan 2003
Location: Macedonia
Posts: 61
Thumbs up

The pressure is now at about 2.4 bar. Thanks to the this two oil additives from this German manufacturer SONAX ( I used oil enhancer and smoke reducer). And if I change the Bearings that would probably make the pressure go up to 3.0 bar. But can someone please tell me what Bearings are, cause really I have no idea.
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Old 01-13-2003, 03:47 PM
Posts: n/a
The crankshaft bearings consist of several cylinders of metal (split down the middle for ease of assembly) that encircle sections of the crankshaft in areas that the crankshaft is supported by the engine block. These bearings contain orifices that allow pressurized engine oil to be squirted between the crankshaft and the bearings, thus avoiding metal-to-metal contact between these components. Ideally, the crankshaft is always floating on a thin layer of oil above the bearings when the engine is running. Ideally.

The reason that your oil pressure guage is showing a higher reading after the use of oil treatments is that the treatments usually increase the thickness (viscosity) of the oil in the engine. This is not always a desirable circumstance, as thicker oil has a more difficult time lubricating components when the oil is cold. Thus you may be trading a higher oil pressure reading for increased engine wear when the engine and oil are cold.

Take a look at your owner's manual. My guess is that it does not recommend the use of oil additives.
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