I only use the seat cover after working out, beach, and hikes (you don't want sunscreen allover the leather). Leather seats absorb sweat into their upper layers and especially around the stitching. The salts in sweat are absorbed by the leather which causes splitting and cracking. Also the fats...
This works great for keeping your leather seats from absorbing sweat or dirt, especially after the gym, hiking, or outdoor activity.
Some nasty people insist on just using a towel but that does not work for super sweaty situations because it will go straight through the towel and into the seat...
Get the 3.0 Premium. I have zero regrets in getting the 3.0 Premium. You get all the technology with the Premium. I drive 42 miles a day to and from work (mon-fri). I'm averaging 24 miles per gallon.
I've always used Chevron for my Yaris, but I'm thinking about switching to Shell for my Supra.
I read BMW has recommended Shell V-Power® NiTRO+ Premium Gasoline for all BMW M models since 2015....