I'd sooner use used motor oil than a used accumulator. They are disposable and perishable. They should be replaced every 100k whether they have symptoms or not. By the time the symptems are noticable the system has been thoroughly stressed.

They can be tested fairly easily once on the car if one has the gauge to hook to them. Only thing is if I were testing them I would probably charge more than the price quoted in this thread for new ones. Kinda silly.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician