How Often do You Change Your Oil

[Ltngdrvr]

Been changing oil/filter in mine at about 15K for 570K miles, of course 15K goes by on mine in about 6-8 weeks!

 

[Cummins12V98]

Since I bought my 01 Sport I drive it 100% in the Summers. So I am at once a year change before i head South. I still do a Blackstone. Last two changes were 7-8k. Prior all changes were at 15k with sample taken.