I had a optima battery last longer than three cars - and one of them was a MB diesel!!! It only failed when it was in my dodge truck and fell off the mount into the belt pulley, rubbed a hole right through it. Still worked for a couple weeks then died..... I swear by these suckers now and have installed them in all the company plow trucks which used to burn through several batteries a season.

__________________
1983 Mercedes 300SD
1987 Mercedes 300SDL
2001 VW Passat 2.8 AWD
2007 OM642 Jeep WK 4x4