I'm looking to buy a 1997 E320. It has 174,000 miles on it and it costs $3,700. I don't know if I should buy the car or not because it seems like it has a lot of miles. When I took it on the test drive there was a moment where I put the car in reverse, backed up and put it in drive. When I accelerated the car seemed to delay and then switched gears quite loudly. Is this car even worth buying???