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 Mobil 1 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 Pennzoil Platinum would be a good alternative and be good to go 7k? I see it priced better and see lots of guys like Pennzoil. Also what do you think of 0w20?