did my a6/z6 mini me about 5 months ago. after all was done and what not i did a compression check. 210 on all 4 cylinders. now yesterday after oil change and what not im getting 210-130-150-210. now this makes me believe its the head gasket which i did replace with a metal z6 head gasket when i did the mini me. i also poured cap of oil in the 130 redid it and got 190 psi. so im thinking it is my ringlands because if i use my motor to decerlate for long it burns oil. if i just do my daily go and not use my motor to decerlate it doesnt burn oil. what could cause that massive drop in compression? i dont run my motor hard much i would say i run it hard once every other week for couple seconds. any advic? my next option is dump the whole motor and go for a d15b but ive been hearing lots of bad stuff on it. oh yea my z6 head is brand new and rebuilt. i guess i could sell that and pay for most of the d15b