I'll second that you want more than 600cca. If you were less than an hour away I'd run a meter and charger out to you. Sorry.

The Bosch battery that Advance sold me has been working great for me.

If it were me I would probably buy a cheap charger and recharge the original battery. Your 300 SD should drive all day like that if you don't use the headlights. Then you could drive to the parts store and have them stick a meter across the terminals while the car is running.

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Greg Schwall

1983 300SD - 465,000 miles