I have to add water about every 3-4 weeks..not a lot but it always takes some. When I first checked my original battery after owning the car a few months it too took a lot of water, as it aprobably was not checked very often. After about a year and 1/2 the cranking become slower and slower and finally had new battery put in. Original lasted 7 years.

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95 E420 ( 76K) SOLD
85 380SE(125k)
95 SL500(72k)