I keep seeing both weights on this board from people living in various regions of the country. Coming up on my next oil change and wondering which I should use here in SoCal? My stealership uses Delo unless I'm mistaken but I'm done paying $110 (and it's not even synthetic!) Also gonna switch to synthetic. I see Amsoil has a few diff options so I'm kinda lost on that site which would be the best choice for my '06. Pep Boys and Autozone near me both have Mobil1 5w40/synthetic. Thanks in advance!!