Dudesky! I love you man! You are the first person that didnt lie about fuel economy!You make me proud! I heard people here with carbed 5.7liter engines saying that they get 22 MPG city.He he.
So whats VANOS? Explain please.
I think that the condition of the engine is established not by the mileage, but by its internal clearences. If it doesnt have any severly damaged bearings (due to debry, overheating,oil problems, etc), burnt valves, worn out guides, scorn cylinders or some piston or ring damage, then its fine to work until its compresion goes down to 130psi or lower (on unmodified cars). At this point the cylinders are pretty much done and will start smoking any time soon. From my experience. I have seen whole bunch of problems like bad tickin lifters, rounded off cams, bad valve seats, etc. But as long as your piston to wall clearence is fine it will run no matter what. (unless theres a spun main bearing)