Looks like mileage is right?

One has to be careful about assuming what the mileage actually is on any used car especially ones with 5 digit odometers. I've seen cars with 227K miles that were garage kept that could have easily passed for 27K miles. Personally, 170's I've owned have always held up better than any of the 225's I've owned so no burning of oil doesn't surprise me even at 127K mi. I bought a car once with a mint original interior that was marketed as ultra low miles based on the interior condition. I was able to track down the original owner who said he personally had put over 300K on car in the first five years he owned it using for work as a salesman, but had seat covers put on the day after he bought it. So the original fabric never saw the light of day until the person I bought the car from removed those covers. Maybe it's true, probability says it isn't. If your happy with the condition of the car for the price you paid, it's a winner! I'd agree that, given your PA location, if the car is also from PA, it's low winter mileage and was certainly well cared for. To answer your question regarding the green coating, it's the remnants of the chemical bath the lower the welded unit bodies were dipped in. While proprietary (secret) per Chrysler, in some literature, they called this a phosphorus bath, used to treat the metal and inhibit corrosion. Best of luck with your great find !!