Posting on behalf of my brother. There are many LBZ posts about coolant loss generally resulting in hg as the culprit, but i started a new thread due to the quantity of coolant. He is the original owner of an 06 LBZ with 340k miles give or take. Would need to clarify but i think he did hg maybe 100k miles ago. He says he is going through a gal of coolant a week sometimes every couple of days. Not a single drop on the ground, no visible leaks, no puking out of tank, oil looked ok, no exhaust vapor/steam/whatever. Pressure test showed 1-2 psi drop in 30 mins. Its a daily driver and tows frequently for work without any obvious performance loss, says it runs like a champ hahaha. I seem to think if it was a head gasket issue, at this rate wouldn't it "hydrolock" a cylinder preventing it from firing, resulting in odd engine performance? He pulled his glowplugs too, wouldnt there be signs there? Am i on the right thought track here, or am i over thinking it and he more than likely needs new head gaskets? Oh and its stock except for an afe intake, downpipe back exhaust and edge juice w/attitude.
