Seems the original batteries that come with oem cars always outlast anything out there...My 2000 ford diesel van has two batteies, I just changed the original motorcrafts last year... The new batteries are already having trouble turning the engine on cold days... they're loosing cranking amps and decaying at a much quicker rate.

You can bet the dealers don't want batteries giving up under the warrantee of a new car... I'm positive original oem batteries are "different" than anything you can buy over a parts counter.

For the record, the reproduction antique batteries never seem to last more than a few years no matter how much use they get...or how well they are maintained.