On my 6.4 , Just wondering what you diesel techs in the forum may think about this, changing my oil every 6 months seems a little extreme to me and that is what im being told. I think once a year would be enough. Example-aug 2012 oil/filt change now have only 1,500 miles on oil/filt. For dealer to $100.00 a pop is alot, It looks like even if i do myself its 89.00 for oil and filter and I will have to get rid of all that oil. Thanks for your advice.