It varies based on a lot of factors including harshness of environment (attacks rods and seals) and roughness of roads (basically, how many up/down cycles and what have been the magnitude of those cycles). And there are varying degrees of "wear". After 30k miles, at least some cars will likely have lost a lot of the basic good handling but the car is so capable and it goes away so slowly that it will still drive acceptably and you may not miss the extra margin of handling until you drive someone else's M5 with fresh shocks and bushings. After 50k miles most all M5s would be in this "worn" but not "shot" category. By 70k miles or so, your handling is most likely definitely degraded but again, you can probably still drive and like, not lose control of the car. But you won't be out-slaloming a Porsche, either. FWIW, I changed my shocks at around 72k miles, and the difference was like night and day, so I figure they were long due at that point, maybe for as many as 10-20k miles. By the way, failing dampers usually don't get stiffer when they get old, but rather they get sloppy and loose. Do you mean that the ride has gotten harsh/uncontrolled?out of curiosity does anyone know what the lifespan is of the OEM rear shocks/struts? My '00 beast is starting to feel stiff (70K miles) in the rear and I am thinking about replacing them.
+1 I am with you. I got caught up in the FSD technology, b/c I didnt want to make my car too stiff like I have done on other cars. I think next time I will err on too stiff rather than too soft.I put Koni FSDs on my 2001 M5 and I have about 10,000 miles on them. They are very comfortable on the street, but way too soft for the track. They also RAISE the rear of the car 1/2 to 3/4 inch from stock. Check the board here for other threads--some guys cut out one coil on the rear springs, etc. When I do it over I will go for the Bilstein PSS9s next time and do it right. :crying2:
Do you mean that the ride has gotten harsh/uncontrolled?
The thing about FSDs is that they have great ride quality but they do elevate the rear slightly (only because they lack the lowest ring perch that OEM and Koni yellows have). They are also firm when taking turns. The magic of the FSD feature. But regular Koni yellow sport shocks are more consistent on firmness and probably a better choice overall. They don't raise the car at all.On a side note...I certainly don't want to purchase any shocks that will kill the ride quality and elevate the rear end. I had a 328i that I dropped 1.25", and although the rims looked great tucked under the rear fender and it was amazing coming off of off-ramps, the daily driving ride quality took a severe hit.
That's for sure.BTW you gotta do that research when it comes down to struts and springs, you have to know what you want and does it conflict with what you need, because truth be told the e39 m5 is a very sensitive car when it comes to suspension. And the last thing you want to do is invest into the suspension and regret it... Read reviews and frequent other boards.
Why do you say that? Have you tried them or is it just what you've read. I don't know that I totally disagree, but I find now that the only real drawback is the slight rear elevation. I'm now used to it and actually kind of like the raked look. The ride quality is really good for a car that handles so well. It will handle better with yellows but won't ride as well.Forget FSDs--you'll regret them.