I have a 2013 Impala, and a '99 Grand Am, both have sensors for oil life. We just drove the Impala to Oregon, that's 12-14 hours of highway and freeway driving, and a funny thing happened. Our oil life was at 55 %, but after about 6 hours of 70-80 mph in 95-100 degree desert freeway, it showed 92%! I'm loving this. I understand the heat and circulation can sort of "burn the gunk out" of the oil, and I do trust the sensor. But how many of you ignore it, and just do 3000 miles regardless? The other funny thing was...my wife tried to reset the trip meter after fueling up, and switched to kph....suddenly we were going an indicated 130 as we entered the freeway, and she was worried she was killing the car, but people were still passing us. Kinda cool, I had never noticed, but there's no dual numbers on the speedo face. You just tell the car which system to use, and the numbers are right.