The 50/50 split sounds 'nice', but it's on their own quoted work. IANAM, but 20 hrs sounds like a lot...10 actual hours turns into 20 on the bill to make you feel like they're taking care of you.
If you want to keep this vehicle for a while, I'd strongly consider taking a bit of a hit and finding an honest independent mechanic to look (can't personally vouch, but look into 'German Auto Specialists'). If not, you might work on a trade-in with this same dealer for a different car (and get the damn thing independently inspected this time). You'll never have a better position to argue a trade-in close to what you paid on the Merc.
Before it sat for a few days, was the drive you did before different than the other drives in distance and longevity? Did you drive ~50km 10 times, or a bunch of shorter trips and then maybe out to the mountains and back or something? Just thinking a longer drive where everything actually gets up to temp for a while could be what presented the issue...
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