I use the old hot rod trick.Drain coolant cold motor,remove thermostat,and put conection back.Fill with one gallon vinegar with one good squirt of dawn,fill rest with water.Go drive 15 miles on the freeway.Let car cool,and flush good with water,use your anti freeze.I use prop gycol,as its way better,at 100% and no water.Good for 10 years.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt