Big John wrote:

Peter

Let me pose some what if's.

I have a turbo normalized engine. Going cross country I cruise at 5K
and 65% power. Turbo is off.

I then go on another XC and cruise at 15K and use turbo to pull 65%.

Are you saying that cruising at 65% with turbo on will do more damage
to engine than pulling 65% with turbo off??????

I'll agree that the turbo will require more maintenance it used but
engine no if run within engine manufacturers specs.

Possibly, because the air is much thinner at 15K than 5K and thus
pulling the same power from the engine will cause it to run much hotter.
Depending on how much hotter it runs, wear can be accelerated and you
would certainly want to change your oil more often and run a semi-syn oil.


Matt