I have a 2009 Nissan Cube Krom with the CVT. It has about 64k on the odometer. It has always run Dino oil changed at 3000 miles. I recently started doing a lot of highway miles for work, and some stop and go at customers. I was thinking of switching to synthetic and my change interval to like 7500 miles. Would this be okay for my driving and for this car? Would I be better running a blend? But with a blend would I be able to change my interval of changes? Thanks