I don't know if the previous respondent has had bad luck, or his Diesel's killing batteries (they are harder on a battery), but I've gotten 7 years or better out of every premium battery I've owned. And I'd consider the battery in your car to be anything but a "cheapie". I'd recommend that you simply check the voltage occasionally, and watch for a drop off. Or, better yet, just wait until that first time when your battery just seems to having a tougher time getting its job done (that's what I do, and I've never been stranded). Then change it out with another high quality piece, and you should be all set. Good luck!

Michael
'92 500E
'88 300TE

------------------