Blowing Smoke, Turbo Melted. New Turbo, Still Blows Smoke

[boostdef]

Hi guys,

Just had ACL Forded pistons and rings, block bored and honed, ACL performance big end bearings, Stronger value springs, cylinder head overhaul (port and polish), Tomei upgraded camshafts, adjustable cam wheels, high performance cam belt, 500hp bb Garrett turbo, 40mm external wastegate, braided oil lines, high flowed injectors, up graded fuel pump, universal oil breather tank, inter-cooler, hpc coded inter-cooler pipes and rocker cover, Apexi carbon fibre front strut bar, Apexi S-AFC, new tie rod ends, 3inch oval muffler with 4inch gold exhaust tip, new radiator core, boost controller, new water pump, wolf 3D computer...

Problem is, the first turbo melted, and we thought it was the turbo causing the smoke, and so on. Now that the turbo has been replaced, it is still happening.

Now the smoke is blueish, and the compression test shows good(obviously the oil is pressurising it), however, the 3rd spark plug keeps fouling with oil.

Now the mechanic who rebuilt it suggests that its a manufacturing error in the piston ring, and that would require changing.

Now, I need to know if this is possible to kill a turbo, also, how much labor (Estimate of course) would I be looking at to get the ring replaced.

Before you ask I should know this, I got all this work done.. I purchased this car like this (For a damn good price) from a mate, who has had enough of the problems.

Im happy to cut the grass though

Any help would be greatly appreciated. Cheers.