My 1992 300E performance was not good after sitting for several months. In the Washington area I'm in it is impossible to find non ethanol fuel. I know the CIS system does not tolerate the alcohol very well as it will absorb water. I put in a bottle of Techron and took a trip and engine is much better. I normally use Techron but wonder if there is a better additive such as SeaFoam.

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Handyjay