I just had one of my techs do the vanos reseal kit on a customer's 2000? E39 525i. We quoted 4.0 labor hours to do it, went smoothly enough. I never heard back from the customer as far as if the car felt different after the reseal.
Since my old thread got bumped, I might as well give an update. The car is now at 206k miles and doing great. I'm still using the Mobil 1 10W40 HM at 6k intervals. According to a used oil analysis, this oil is working well for me.