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Caspar: I agree in most part with your comments. However, I think it is neither necessary nor practical to hold the revs to 2500 rpm.
RF: The two enemies of a new engine are excessive revs when cold, and heavy loads (lots of boost). Once the engine is _fully_ warmed up (I am talking about the oil temp, not the water temp - the oil always takes longer to heat up) you can let the engine spin up as long as your foot isn't planted on the gas pedal. Saab recommends no more than 5000 rpm for the first 1200 miles (I think that's the right miles). This is a little too high for me - I tried to stay below 4000.
There will be times when you need to accelerate in a hurry during the break-in period. Try to avoid lots of boost. Let the engine rev in a lower gear instead.
And even though Saab says you don't need to cool down the turbo, develop the habit anyway. It never hurts, and can only help the life of that highly stressed part. Drive easily (no boost) the last 2 or 3 minutes of a trip to let the red hot metal cool down a bit. And if you are unable to do this - for example, pulling off the highway at a viewpoint after climbing a steep mountain grade - be _sure_ to let the car idle for two or three minutes. There are folks who poo-poo this practice, but it does help your turbo to live long and prosper.
This car goes SOOOO easily on the highway - limiting it to 60 mph would be ridiculous. This is a 150 mph car! 60 mph is just loafing along. I think you ought to keep it below 100 for sure, for a while at least ;)
The engine in my Aero Wagon seemed to smooth out and free up dramatically at about 1000 miles. I suspect there is some programming that protects the engine during the first miles. Can anyone confirm or refute this?
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