The Mercedes branded battery in my 91 300D last exactly 6-1/2 years. Not bad, but nothing to write home about either. In my close to five years of ownership I've been meticulous about water level, etc....

Bought an Interstate reconditioned battery for $40....first time I've done this. I'll be interested to see how long it lasts. I figure anything over three years or so makes it a good deal.

Anyone have any experience with reconditioned Interstates?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 75k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife