First of all let me say that this is my first post in this forum that I have enjoyed very much. I have a 02 Pathfinder LE with 7000 miles on it. I am convinced I should switch to M1 synthetic, but should I use 5/30 or 10/30 and is it ok to use oem oil filter with it. I still have 10 free oil changes coming from the dealer so I will have to take the oil to them. I live in Illinois. All of your professional advice and comments are appriciated. Thanks