I use vinegar in my 617.951.I dump a gallon in a cold engine with thermostat removed,I add a squirt of dawn dish washing liquid,and run engine with heater on for 15 minutes.Then drain,and let engine cool down and flush till no smell with garden hose feeding upper hose to radiator,with hose disconnected from thermostat housing.Learned this trick years ago,as vinegar is a mild acid.

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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