There's an early-generation ML320 in the extended family, one of the ones with the problematic harmonic balancer. The HB is starting to show slight cracks, and I figured I should get in there and replace it this summer.

That plan was superseded by the MB official replacement campaign, and wow, am I glad not to have to waste the weekend I had budgeted!

My experience with factory recalls and service campaigns in the past has been that they do the minimum necessary to address the single bad part, often re-installing or ignoring easily accessed wear items nearby.

In this case, would it be smart to pay extra to have the front main seal done at the same time? I know there will be the usual monstrous dealer parts markup on the seal itself, but the labor charge ought to be minimal. Serpentine belt, too, though that's certainly a lot easier to do at home later on!

Anything else worth PM'ing while the balancer is off?