This is the BMW & Mercedes authorized injector cleaner and I highly recommend it but it is some vicious stuff and one little can treats 65 liters. Do NOT let it touch your skin, as it absorbs fast enough that you can taste it pretty quickly from contact. I'll translate the name and get a better picture when I get home tonight.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course