First, thanks for having me on your forum. I'm a Yank, working in Sicily, Italy, driving a MB! (Go figure!) I've already got the head removed without issue. I found the head gasket leaking at the back of the head, no codes, no water in the oil and no signs of steam/water in the exhaust. The pistons, valves, timing chain and cam gears are in very good shape. Could be age or not correctly servicing the coolant system with the correct coolant? I've read that the wrong coolant can compromise the head gasket. I have checked the head for warp, the deck is true. I am on the fence about getting it skimmed at a machine shop (increased compression and the chance the head bolts will bottom out), suggestions appreciated. I'm also need to know if the head bolts need to be installed "wet" (sealant on threads). I'm not sure if the bolts pass through a water jacket. Thanks in advance!