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Old 05-29-2013, 09:36 PM
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Join Date: Mar 2012
Location: Marietta ohio
Posts: 46
1985 500 SEL fluid capacities

hi everyone its been a long time since ive posted last but ill get straight to the point first and then fill you in on my new cars after haha. anyways...i just bought a 1985 500 sel and was wondering if anyone had the fluid capacities of the car...specifically the hydraulic suspension fluid capacity. all other capacities will help me as i tune it up but that is the most pressing.
now for anyone who may care lol...ever since i bought a very clean but neglected 300sdl over a year ago i have been absolutely hooked on the w126 body cars. i did a full tuneup on it with glow plugs, system purge, new filters, engine shock mounts, shocks and springs, monark injector nozzles and some new ball joints etc. is an absolute dream. i used to be a full chevy guy but now love my w126 cars. i just traded a camaro i had for a beautiful 1986 560sec which only had 81k miles on it when i got it. and today i picked up the 1985 500 sel with only 76k miles on it for what i consider to be a steal of a liftetime. all three of my w126 all have a seperate place in my heart now haha. anyways...ill update my account with my new cars and some pics sometime if i can. and thanks again for all the help everyone gives on this forum...its priceless. i try to give back any knowledge i come across as i go along

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Old 05-30-2013, 05:08 PM
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Join Date: Jun 2002
Location: Conway, SC
Posts: 319
If the hydraulic system is completely empty it shouldn't take more than two litres to fill it up. If you are going to flush the system you may want to have three litres on hand.
Mercedes Benz Master Tech - Retired
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Old 05-30-2013, 05:55 PM
compu_85's Avatar
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Join Date: May 2008
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Does your car have the 4 corner hydromenumatic system or the rear load levelling system?

1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
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Old 05-30-2013, 07:19 PM
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Join Date: Mar 2012
Location: Marietta ohio
Posts: 46
[QUOTE=compu_85;3153835]Does your car have the 4 corner hydromenumatic system or the rear load levelling system?


my 500 sel has the 4 corner hydropnuematic system. and thank you RPM for the response.
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Old 05-31-2013, 12:26 AM
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Join Date: Sep 2004
Posts: 9,087
Thumbs up

If the SLS system is empty, you almost certainly have a leak.

With that four corner stuff, you should be in for a great time locating and repairing that.
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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Old 05-31-2013, 12:37 AM
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Join Date: Mar 2012
Location: Marietta ohio
Posts: 46
Yes I believe it just started leaking on the rear driver side shock. The system was at ok level when I drove it 250 miles but the shock must have gone out finally in my driveway or close to home. Unfortunately It went so low that when I moved it to my garage from the driveway the caliper rubbed the inside of the wheel and punctured the metal. But at the price I got the car and overall condition I don't mind repairing it. But I'm very pleased with the car overall. Fits in well with my w126 family

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