Just changed mine it was an Advanced Auto Store Titanium. It lasted 5 years. I put back in same battery as 5 years is a good life to me. I hear Interstates are the best but I have no supplier and Advance tests and installs. 13 year is amazing also! I hear the clocks drains batteries on a 300SD so when I garage mine I Trickle charge it.

__________________
1982 300SD