Agreed. Replace all hoses and use either mb coolant or xerex g05. Depending on your climate will determine the coolant/water ratio. If you are somewhere where the ambient temp is warmer year round then consider a 70% water 30% coolant or higher water concentration. Otherwise 50-50 would be good. I'm currently running straight distilled water and water wetter because temps here year round are around 80+. Do a vacuum test to check for leaks that cause misfire

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1990 190E 3.0L