I use Mobil1 in my car and bike.

DS, yes, I change every 5K or 6 months on the car, 5K or 1 year on the bike. I never hit the 5K marks so it is by time. That is also what is the recommended intervals in the manuals. I bought a new ranger in 93.Used M1 oil. Used it for field service work, I had close to 150k miles on it when I traded it in. Still ran great, wasn't burning oil. The only problem it had was the clutch was starting to go out on it. [X(]


To the OP's question, If I were to get the Challenger, I would goto Synthetic after break in and a few extra miles.