Please help with this madness.got the headgasket done on my mg zr 3months ago.it just blew a days ago.I paid £550 to this garage to fix.now its gone just can't believe it.should repairing a crack be included in that price.the oil is proper cream.it still drives.as well the guy that done it said after head gasket is done it needs3-4 oil changes is that right.should it go with in months of getting it done.please could someone help me.