I have a question? How often do you guys, and gals, change your engine oil and filter? I have a 2012 SV and I always change mine every 3K. That is what I have done regardless of the vehicle or type of oil I use. I know now things have changed with the improvements to oil,........ so I am wonder if I am wasting money and not getting enough out of what I already paid for? As a side note, I use 5w 30 full synthetic oil.