Oil change was uneventful. So I won't really go into it. The front underbody panels were totally dry. The rear one (the part under the rear main area) had oil pooled in it. The car wanted me to add 1 quart and based on what came out I'd say that was pretty much dead on. I used the LiquiMoly Molygen 5W-40. No additive (i.e. Blue Devil) so I may be adding a quart every gas tank. We'll see. I could try AT-205 I guess.
For coolant, I decided to disconnect the lower intercooler pump hose as this is easy to get at and the lowest point of the cooling system. It took a while to drain and I helped it at the end with compressed air into the main reservoir. Ended up getting maybe 2.25 gallons out. Capacity is 13.xL so...whatever that means.
To refill I used my handy vacuum filling tool. This time I drew a pretty deep vacuum and when it was done sucking in, the level was PERFECTLY at the full line in the reservoir. It's so amazing how easy this thing is, and no bleeding anything. I will keep my eye on the level for a few days as I did in the S550 but I think I'll be fine. Worst case I can bleed the intercooler system as I have done in the past (run pump manually, run hose from pump outlet line back to reservoir until air is gone).
142,103 miles.