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Old 02-23-2013, 07:18 AM   #10
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Originally Posted by lddavis View Post
According to the owner's manual (including the ST supplement), no break-in period is required.

I find it hard to break old habits, so despite the manual, for the first 1000 miles, I do the normal break-in thing:
- vary the RPM (not necessarily "speed"; if you're on the highway, move between upper gears occasionally to vary RPM even if you're stuck at 65 mph)
- avoid high RPM at first (hard as that is with an ST :)) and only gradually increase the upper bound
- make sure the engine sees at least some instances of high pressure (open throttle in a higher gear will do this without necessarily causing a lot of acceleration, RPM, or speed)
- make sure to decelerate under vacuum as well (leave the car in gear and take your foot off the gas when approaching a stop, etc).

Change the oil and filter after 1000 miles.
Straight from the ST supplement

Your vehicle does not need an extensive break-in. Try not to drive
continuously at the same speed for the first 1000 miles (1600 km) of
new vehicle operation. Vary your speed frequently in order to give the
moving parts a chance to break in.
Do not add friction modifier compounds or special break-in oils since
these additives may prevent piston ring seating
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