Yea the 06 350z has the same problem. My friend just replaced his short block in his 40th. Get it replaced you have no other option. My 06 had that same problem and when I supercharged it it went caaabooommmmmm. The dealership still replaced the motor because i have my maintanence done by them and they didnt catch it. The short block is the bottom half of the motor. somehow the cylinder walls dont quite match the cylinders and it causes oil leakdown to be combusted but its so minute that its hard to tell because the exaust doesnt smoke or anything. Its all good you get a brand new motor for freeeeeeeee.
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