No need to change oil at 1,000 miles because of changing brands. Change as recomended in manual. I use Amsiol full syn. in all mine and change it at 10,000 miles with filter changes at 5,000 [top off oil after]. Use a brand of filter you trust.
If you have lots of free time, there are plenty of threads about oil and filters, they are also the most unexciting! I change my oil and filter around every 5000 km, maybe its overkill, I don't know, but I like doing it. I use K&N filters because I like the nut on the end, it makes it easier to torque it on and get it off.
________ Lovely Wendie99