They cost more than the standard lead acid batteries but they don't leak acid. Any reason why the glass mat units can't be used in older cars?

Unless your car is inverted, you should not leak acid. The most common cause of acid being pushed out of a vent tube is overcharging. Overcharging may not cause the AGM battery to spill acid, but it will greatly shorten its life.

I use them in all of mine.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

If you're looking at an AGM battery, and don't want to get hosed on the price, you might check out Deka brand batteries. They seem to sell to the truck companies and equipment manufacturers more than the automotive market, but they will sell to you if you go to them.

I bought one for my Z car, at $95 for the battery, instead of $160 or so for the Optima branded AGM.


Happy motoring!

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...