Okay, the ONLY true way to know if your oil is 'done' or not is through analysis.

I drive a Cummins turbo diesel Ram (and a Fit!) and know MANY guy's that are using Amsoil and only changing thier filters every 10K. One guy is religioulsy having samples of oil analized and the resulst for silicon, coper, xxx, etc... are perfect. He's now pushing 85k on ONE oil change. I personally go 5k.

If you're paranoid and like blowing $'s, then change your oil every day. If your eco minded then do what the manufacture says OR better yet, have a sample analized and know for sure!

--d

 

i listened to the dealer and got my oil changed at 5k miles with royal purple.