SL/R230: Value of 2003 sl500 with mechanical issues
Tires are meaningless, they can be replaced.
Suspension, top and who knows what other issues will cost you thousands.




He has stated that he sunk around $7000 in it before the suspension went out and that was apparently the last straw. He was hoping to recoup close to that amount back, but it looks like I can buy a running one with about those miles for $3000 more, and the repairs in parts alone will more than likely exceed that. I just wanted a fair assessment as I know the person and would like to show him some educated thoughts on the current value of the car
The previous owner's investment and recent expenses on the car mean nothing.
Offer $2,000 and be willing to negotiate up to $2,500 if you really want the car. Then move $15k into an a separate bank account so you can start ordering parts.
You will then have almost $20k invested in an old high mileage Mercedes. Is this what you want?
Everything from cls55 sl55 e55 cayenne turbo, cts-v 997 turbo, and then there’s the ls swapped cars that range from a 94 c1500 short bed to a Datsun 240z , a 500sec with a blower to an sl600 r129 with a turbo lq4 6 liter.
Then you have a couple of 996 Porsche ls1 cars one with a twin turbo setup and one convertible automatic that my wife drives. My 17 year old son has an 81 380sl that has a transplanted 500 engine in it from the w126 500se I ls1ed as well. Throw a couple of late 60s firebird 400 and riviera, you have a fleet.
I am an absolute glutton for punishment and most times soend foolish, but not always. I should give all this stuff away and go buy a new car, but I would have nothing to do but drink beer and eat pizza. Anyway this one is for my son, we already bought a basket case r230 and this other one was presented to us and is in better condition than the first one. Trying to pass some of the skills and car purchasing foolishness on to the next generation.
Last edited by cdk4219; Sep 11, 2021 at 06:28 PM.
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For the best performance, you'll want a coilover kit that includes sway bars. The cheapest kits with sway bars use sway bars from european V6 models. The V6 sway bars are a bit light for a V8 car, but they are better than no bars at all. You can get a kit that has more robust sway bars that accomodate the increased weight of the V8 from VVK, but it is more expensive.
To a lot of Benz purists it's blasphemy to convert an ABC car to coilovers, but when you look at the cost of repairing an ABC system versus the value of the car and also consider the ongoing reliability of the suspension it really comes down to choosing between converting to coilovers or sending the car to the scrap yard.
I'm in agreement with previous posts - I don't think I'd bother with an SL500 with ABC problems and possible top problems unless you could get the car for nearly free. They're nice cars, but performance wise a little short on power for their weight. An SL55 or a V12 car (SL600/SL65) is definitely worth keeping on the road.
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there are tons of other cars without these issues for not much more money. As a project car with you fixing everything - the idea has right to live. To fix it and drive it - does not worth it. I would not buy a complex car like this with issues from the get-go.




Do you have DAS XENTRY? Could be really valuable in the issues diagnostic and repairs .
Good luck and keep us posted.
Those are minor items- but the point I'm trying to make is that you won't catch EVERYTHING and even if you buy one for a little more money, be ready to spend some money to address items that may have been overlooked during the inspection process that normally aren't on the checklist
No matter who and where you buy it from, I highly advise you get the car inspected before you purchase. Car dealers usually do a safety inspection which doesn't address ABC leaks and other high end systems on that car. They do a visual inspection, change the oil and advertise it as perfectly healthy car.
oh yeah new batteries and a newer shifter
Last edited by cdk4219; Sep 13, 2021 at 04:32 PM.


Moving the car around it didn’t go down or leak. Came in the next day and still fully extended and put the scanner on it. 7 codes on the suspension, all four level sensor faults, malfunction in pressure supply and a couple of others.
After clearing the codes, he started it up and pushed ride height buttons with it in reverse, and the car went to normal ride height. Backing it out of the shop the car started to raise and lower all four corners intermittently in gear and wouldn’t stop the rodeo. Pulling codes now have us critical vehicle level front left, malfunction in pressure supply.
Before backing the car out, we took the chf11s out of the reservoir and replaced it with new. The fluid is black and burned. What should I look for now,I have an extra tandem pump if I need one, but it seems the pump is working, but maybe not so much when it gets hot?
Last edited by cdk4219; Sep 19, 2021 at 02:00 PM.




plenty of posts in the forums on how to perform these diys. Search is your friend.
I guess the nice thing about the car lifting and lowering all corners is it’s easier to flush it’s doing all the work.
5


If there are no problems with the control valves, check actual values of all of the acceleration sensors, level sensors, and strut travel sensors. Make sure that you are not getting random accelerations and that the level and strut values change properly with changes in level.
The car still raised up snd down randomly when I’m gear. I don’t think this is a fluid issue, and while flushing it with $150 worth of chf11s would do it no harm, I would like to straighten out the root cause electronically.
It looks like the actual level sensor values and the actual level values aren’t correlating. The sensor voltages are high low high low for and the actual height read is low high high low
Possibly the right front sensor or plunge sensor is bad? Couldn’t get it up on either lift to check wiring or broken sensor arm. Whats the data point to?
Last edited by cdk4219; Sep 20, 2021 at 08:48 PM.


2) Those values show a very low vehicle. Note that high voltages = low position on the LEFT side, low voltages = low position on the RIGHT side. Zero height should be around 2.5V, calibrated height is -4mm. Your level values indicate that the care is 1.5-3" low, depending on corner. If it has stock diameter tires, wheel well height should be about 27.5". A -76mm reading on the right front would be around 24.5".
3) Left front strut extension seems low for the position, but it might have shifted around between readings.
4) The C1525-7 code is critical vehicle level at all corners except the right rear, consistent with the height readings.
Do you have the 'Move to Calibrated Position' actuation? This should bring the vehicle to right around -4mm at all 4 corners. Does the car respond to the height switch? It should raise 1" between the normal position and the fully raised (2 leds) position. Normal height is -4mm, fully raised height is 21mm. However, the control is not real aggressive at getting to these levels exactly. Is there any chance that the car has a lowering module installed?
When I took these values the car looked to be at the correct ride height, or very close to it.
Last edited by cdk4219; Sep 21, 2021 at 03:01 AM.






