>>The thing to remember when buying automotive batteries is
that there are less than 10 actual battery manufacturers in
the USA.  These include ...

Johnson Controls
Delco
Douglas
Exide
Optima<<

Kent,

I just visited the Interstate web pages  and they have a line called:
Extreme Performance by Interstate. Their models 800S and 800DT, etc. are the
exact same as Optima. It looks like Optima is also part of the Johnson
Controls family.

Garrett Adams
1983.5 Adventurewagen GL