Sounds like the guy knew the head gasket is on its way or has already gone and done a oil change & flush and filled it with new oil. Take it for a long drive and check the oil cap for mayo also i would get a sniffer test done on the coolant. Also i would touch the inside of the coolant bottle above the water for some mayo type
It's done about 150 miles on that oil and there is no suggestion "yet" that there is a head gasket issue as no mayo, coolant is ok although the oil change without plugs and filters does concern me.
One mechanic said it smells of oil out the exhaust yet it's not burnt any so far, not that's visible on the dipstick anyway?
Can't get a comp test anywhere until late last week and I don't know if I do someone won't just say it's the head to rip me off! I still got a co*k up my arse from yesterday so don't want to get screwed anymore