Just bought a Solar BA9 battery tester. Great little tool to have around.

The battery on my 98 E300 is six years old and is reading 750 CCA. Fine but probably not as strong as it was when new. I do notice, however, that some new batteries spec'd for my car are rated at 750 CCA.

When I head into the winter months, how many CCA do you think I would need reliably to start the car assuming a low of 0F? FYI I use a 5W40 synthetic, which makes starting easier when cold.

__________________
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