GenI's maintenance minder is not based on a 5K interval. It's based on the type of driving / driving conditions that you do. In general I have found that if you do the type of driving / conditions that gets you good (for a GenI) overall gas mileage your oil change interval will be longer (as long as 7k miles) while driving / conditions that gets you crappy gas mileage will result in a shorter oil change intervals. GenII is likely to be the same.My G1's system warns that it's time to change the oil at 5k, which is what I've always done - most of the time using synthetic. Our Lexus GX460 comes due at 10k, so that's what we've done on that one (not sure what oil the dealer uses). Haven't decided yet what to do with the G2 - maybe go with what the truck tells me (unless it wants to go past 10k) and use synthetic? It's only at about 1k, so got time to consider it.