I have had a 1987 300TDT diesel wagon (w124) for one year. It has 185,000 miles. I don't know whether replacing the Accumulator Cells would improve the quality of the ride, since I don't know what it should feel like. The rear end doesn't sag, and the self-leveling system works. Do the Accumulator Cells degrade the quality of the ride gradually, over time, or do they just break and you know it immediately, due to a bouncy ride? thanks