I decided to change the oil for the first time on my 2009 C-14 that I purchased used in February. I've put 1,000 miles on the beast so I had to change the oil so I knew when the last change was done. It had 11,074 miles as of today.
I purchased some Rotella 15-40 wt at Walmart & a Fram filter but when I got home I realized I had some Castrol motorcyle oil & some Rotella synthetic left over in some gallon jugs from my FJR days...so I poured them in first...then topped it off with the Rotella that i had just purchased.
I know, my engine will probably blow up. Mixing oil... what was I thinking! I guess you get what you deserve!