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i recently changed out my old turbo cuz it was leaking oil, the shop i took it to had a used turbo sitting around so i swapped it out and put the used one in. they threw it on the dyno and i noticed a large amount of smoke coming from the exhaust which never happened with the first turbo. the smoke is a bluish color so im thinking its something to do with the oil burning.

im thinking its either a bad turbo or the valve seals on my head have gone bad.

any advice?