I was just doing a little research for a battery for my wifes C280.

If my research is correct:

For a MTP-93, Interstate($105)=Autozone($66)=COSTCO Kirkland($55)=MB OEM($140). They all appear to be the same battery.

For DIY testing your battery, here is a good tutorial:

http://www.repairfaq.org/ELE/F_Car_Battery.html


glenmore
1991 300CE
2000 C280
1990 LS400