Do not want to be the bearer of Bad News: there may be more going on here...
How many Miles,
Is there a Ton of smoke at idle, AND
Pure White smoke out the Exhaust...?
Currently i have the same issue, of course i Also
blew the Turbos, and New were installed..
but that is not the problem, as we performed the TSB,
including the Valve Cover, and Now On to engine removal...