Interstates are a great battery..the way to go if the pretty white case doesn't matter to you;-) Optima red tops should be readily available for less then 150..I purchased mine off ebay for 130 delivered about a year ago.

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta