Do you guys share the same mechanic? Mercedes uses the same type of valve stem pressure monitoring sensors as nearly everyone else. Look it up. Mercedes Benz parts. They even have a Mercedes p/n for it. I'm afraid your dentist got major fleeced. And you believe that bunk his mechanic claims?
I could save money by using both sides of the toilet paper to wipe my azz too, but I choose to just go ahead and use a new section. I use Charmin, btw. I'm not scrimping on comfort. Again, it's simply capital prioritization.
No one ever said you didn't get offers on your car. We all have had that very issue to deal with. Most of the time it's wannabes just flappin' their gums at a gas station. I pay no attention to them. But I do know those offers won't be in the typical classic car range in price offers. And that, I'm afraid, is fact. But if it is, take it, because that one guy will be your Waldo. At the rate your going with Doc Hollywood Mechanic, it's going to take a good chunk of change of an offer to make money back from what your getting charged for mundane maintenance.