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So I have done a bunch of investigation. Pressure tests, leak downs and also chased the coolant dye around the engine and it has been confirmed that I have the start of a head gasket failure. I am slowly taking coolant into cylinder #3 which also had a compression of 130. So after going back and...

Looks like my 99 5.7L SLE Yukon finally blew the head gasket with 250’000 kms on the odometer. I started to lose small amounts of coolant without any indication of where it was going. I did a compression test and found Cylinder #3 @ 130 with a wet/water on the plug and #6 at 140 the rest were...