On my '81 300TD, the SLS seems to function fine when the engine is running. I.e., it rides perfectly level whether the rear is empty, full, or pulling a trailer. I replaced the accumulators 3-4 years ago, and there are no leaks. I have not ever adjusted the valve. In the morning, when I come out to drive away, the rear end is sagging low. When I start up and get underway, the system kicks into gear and it's level again. ************** on youtube is doing a series on the SLS, and Kent says that one cause of this symptom is worn springs.

Where would you look for the cause of overnight sagging?

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Mike

1980 300SD
1981 300TD
1998 E320 Gasser Wagon
2000 SL500