Charlie,
My FOMOCO OEM batteries lasted from June 1997 until November 2003. I had Interstate 850CCA's installed and here in February 2007, they are still strong.
My 1997 7.3PSD has 231,000 miles on it. I have replaced the starter once at about 180,000 and it's symptom before it failed completely was it was "dragging". Additionally, I've twice replaced what Ford said was a "sensor". It also caused slow starts.
All in all, this PSD has been a solid performer. Just can't bring myself to get rid of it just yet.
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