Luigi,
As I had mentioned to you earlier, my head gasket was lifting slightly under high pressure and dumping coolant into my combustion chamber(i.e. periodic white puffs of smoke in exhaust) and then resealing. My coolant system passed a pressure test and there was no coolant in my oil. The coolant was only getting into the combustion chamber and out the exhaust and the coolant was not getting into the oil system. You need to "bite the bullet", pull the head, pressure-test it and have it mag-particle tested for cracks. If it tests OK, have the head resurfaced and re-installed with a QUALITY head gasket, coat the CLEAN head/engine surfaces with aluminium paint(as used for stoves), torque it, warm it up, and re-torque it (i.e. the original torque setting will have dropped lower). Drive it awhile and re-torque it again. Repeat driving/re-torquing the head several times until the torque setting stays set; i.e. not lower then the inital torque setting.
Best regards,
CJR