My car started to have excessive whitish blue smoke out the exhaust at cruising speed while being in gear and in neutral at a stop. I have a greddy turbo running 6psi. I no it sounds like the head gasket but i only have 70k. I did a compression test and all of my cyclinders are within 10psi. of eachother and my spark plugs looked good, so I think the problem is with my turbo. I got a tip that my turbo could have shaft play. Should thier be zero play or is minor play acceptable, because i took my filter off to see if thier was any play and if i nudge the shaft back and forth a few times with light force it slightly moves. Is that normal?????
I heard it might be a turbo seal or somthing related.
Can anyone help?

 

generally whitish blue smoke is an indicator of dammaged pistonrings. but your compression test seems to be good. Do a leak down test and then go from there.

 

If i need piston ring how do you think my cylinder walls look???????