I have a 2014 1/2ton silverado. Bought new and as soon as the first 4 dealer oil changes were done i switched over to mobil1 filter and oil in the recomended 0w20. Change oil and rotate tires every 7000 miles. Everything is fine so far at 148 000 miles. Also tuner turned off the afm at 100,000. Do you think the penzoil platimum would be a good alternative and be good to go 7k? I see it priced better and see lots of guys like penzoil. Also what do you think of 0w20?