It is a AWD V4 with 55,000 miles. Any tips, advice or known problems about this model would be really appreciated. I live in an area with a good amount of snow during the winter, and any opinions on how it handles in the snow would help. Furthermore, even though I'm pretty sure that the 18 rims will allow regular tires in addition to the run flats, could I please get verification of that, and that changing them to regular tires will not mess with the vehicle performance, suspension, stability or tire pressure. Thank you in advance.