I am on old motorhead, and we would build motors, change oil after 3-500 miles during motor break in, then every 3k. When I owned my Jeep, and other cars,suvs, I did the same thing. The owners manual states every 12k to change oil. In almost 40 years of driving/working on motors, I never went 12k between changes. Is the 12k a safe amount with this oil life monitor? What intervals do you all change your vehicles oil? If this is a double post I am sorry for missing the other posting. Thanks for your help.