Hey all, first time poster. This looks like an amazing site to get some opinions. I am looking for opinions on oils for our two different vehicles. I have recently bought all of the necessary materials and equipment, and am going to be doing the oil changes myself - something I've always wanted to do. Looking for recommendations on conventional, high mileage, or synthetic for our two vehicles. I'm in Minnesota where it's quite cold many months out of the year. A little background on cars: 2005 Pontiac G6 GT 150k miles - have not put on more than 4k a year over the past 3 years and that'll stay the same. Rarely driven. 2015 Nissan Altima 60k miles - driven a lot. 50 mile trip to work. Been going back and forth with oils for a while depending on what I read and/or am told. Now that I'll be doing them myself, I'm really looking forward to getting on the same schedule/oils. Thanks much!