I dropped in toe Sterling McCall Acura without an appointment to have my battery checked (car had died overnight) and, since I was already there, do a routine maintenance (oil change, tire rotation). It was Monday afternoon and they were busy, but the service advisor accommodated me into the schedule and patiently explained the issue with the battery. I opted to wait for the car even though a loaner had been offered.
During a lull in traffic, the advisor came and talked to me about maintenance items I might want to consider if I planned on keeping the car longer (the car is already old!). He explained things clearly including which might be deferred and which would pose a risk of a more expensive repair. He also explained the cost associated with each repair and the work involved.
I found the conversation quite educational and helpful.