Quote Originally Posted by dr. d View Post
our 12 year old diesel innova has always had 2sm battery. the last battery, a cheap champion by motolite, lasted 4 1/2 years. it was driven on longer routes.
our 4 year old diesel innova, had exactly the same battery, but driven only short routes (less than 6 km). the battery lasted 13 months.

so, no. i do not think there is a correlation between vehicle age and battery size requirement. other factors are probably at work.
Noted sir. Thanks for the explanation. So i will just stick to the stock size.