I use the Techron Fuel Injector Cleaner. Specifically that, instead of the Fuel System Cleaner. Works quite well.

It is recommended, depending on how dirty your injectors are, to change the oil afterwards.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)