Get Osiris, and as bad as this may sound to some, retard the timing a bit. That should fix the oil consumption issue. I was losing about 4 to 4 1/2 quarts every 4k miles, and we did several compression tests on my motor and everything seemed fine. When I was looking for an ecu reflash program, the guys at Uprev broke down the problem to my friend, and mentioned this fix. I tried it out and it works great... so far. The last two oil changes had no oil consumption at all.
As for what they try to fix... although I know they put an emphasis on the piston rings, they are also listening for sounds from the valvetrain before they decide you need a new motor.
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'05 Black Obsidian G35 6MT Sedan
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