Just picked the pick up with only 5500 miles on it and love it so far. Did alot of intro maintenence including oil and filter. Its about a week later and it's already pretty dark. Previous owners may have not changed the oil so it could be that but what I'd like to know is about how fast do you see your oil darkening. I'll probably change it again in the next week to see if it was cleaning up the older crap still in the system. Thanks in advance.