Highway miles VS city miles
 

We've all seen it that add on craigslist with a car that has 857,405.1 miles BUT they are all highway miles so its not so bad.

But what about the opposite , I put 60 miles a week on my FD BUT they are mostly city miles in Miami traffic so I wonder.

first howmuch worse are my evil city miles and how often should I change the oil its been 2 months and i've put a whopping 700 miles on the car .