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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
optima's are too expensive... interstate or gm goodwrench are just as reliable and are 1/2 the price
Same with the diehard and like I said before, it has an 8yr warranty on it. Not to mention its the most powerful of all available batteries, something like 900 or 1000 CCA (dependent on group size of course).
-P.
never had a problem with the optimas if you make friends with ppl at the parts stores can get em cheap,, had too many problems with other batteries, used to be an interstate man myself but not anymore optima FTW
my 50 dollar wal mart "everstart" batteries in both my mustangs. work great . im cheap and never pay for a name or look. for the price of a optima i have to pass i cant care less. my cars all start easily