I am crazy about oil changes but 500 miles? Yep a waste of money. My mum does about 1000 miles a year, so it will be 3 years for a change. The engine will outlast the rest of the car even though it is garaged.
Gary, higher profile has more rubber and air to absorb impacts hence it will help reduce buckling. regarding curbing, if the rim is 15mm higher, then it might just miss the kerb. regarding parking more carefully, its my 20 year old daughters car who thinks driving is a contact activity.