Just keep in mind that any vehicle that takes a battery inside the passenger compartment needs to be an AGM type for safety reasons.

AGMs are also a good idea for the older models with the battery under the hood. AGMs do not spew electrolyte vapors like standard batteries. This is why most older cars have their battery trays eaten by rust.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

That is my plan with my 98. Jay Bob, any particular recommendations, specs/brands to look for? I see a Diehard for about $170....perhaps that's as good as any.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

The original MB battery in my '97 was flooded cell and located under the rear seat. The vent tube was routed through the floor.

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'97 E 300 D

Bought a Bosch group 49 at Pep-Boys last fall for my 240D. About $110. Don't recall if it was on sale. A nearly-new used battery might be a good alternative to a reconditioned one. Last week I got a $30 2-month-old Autocraft battery at the Pick-N-Pull for my brother's '94 4-Runner. With a blown head-gasket, it needs only to run long enough to move out of the garage when we need to get in the attic.

Happy Motoring, Mark

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DrDKW