MB manuals say not to use any additives. Some folks here swear by Techron and just recently there was quite a discussion on a product sold at GM dealerships. I've used the Lubro-Moly fuel system cleaner and Techron. I wasn't able to detect any improvemnt in performance, smoother idle; better gas mileage.

I wonder if quality fuel and an occasional "spirited drive" are better alternatives.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"