After two independent MB service shops and my MB dealership mechanic recomended only one gasoline for all cars especially MBs , I switched . The gas all of them preferred is CHEVRON . They said the gas is a better grade to start off with and the cleaning additive they developed really works great TECHRON . They said my 1989 420 SEL would see a marked performance boost because of cleaner injectors and less carbon on plugs and pistons . It already ran great , but have noticed much more ''pep''. I bought a bottle of TECHRON to clean out my injectors to start out and with using CHEVRON gas will add another bottle every fourth tank or so . Feedback ?

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