I tried k seal as my well documented thread stated to no avail to me as mine was an external leak, so had head gasket job done with no flush just the standard coolant change when doing the full head gasket job, mine has been perfect! Heating, air con running perfectly, all with 15000 miles since work! And not a drop of coolant gone anywhere! No gunk in was found in engine when stripped apart and none in header tank, and since then after a small oil leak was addressed still no sign of gunk in engine!
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