I am very interested in this thread...I had consistent weeping oveflow at the reservoir, but had similar but smaller puddle more than twice, but less than a half dozen times.

I replaced the filter and the linkage to the leveling valve. Ride height is perfect and ride is good, but it does seem to crunch over bigger bumps, but not smaller ones, and it seems to lose its level fast...like overnight.

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT