A dealer that doesn't know about products that MB requires on coolant flush every 2-3 years has lost touch. Just mix (powder) with warm water & run engine 20-30 min & then flush with water. Not much acid in this formula.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V