SLK/R171: Quick question on break in
It does say in the first 1000 miles to drive at "varying but moderate vehicle and engine speeds." "avoid heavy loads (full throttle driving) and excessive engine speeds (no more than 2/3 of maximum rpm in each gear). Shift gears in a timely manner. Avoid accelerating by kickdown. Select C as the preferred shift program (automatic) for first 1K miles.)
I think the 2/3 of max rpm (about 4000), not driving it hard, vary your speeds, and don't put your foot on the floor to pass, all make sense. I would assume the 280 is pretty similar.


