Not sure if this is posted elsewhere but I just wanted to let everyone know that Mobil 1 5W50 is on sale on Napa website for $5.49 per quart with free shipping. I just bought 20 quarts.
Link is:
https://www.napaonline.com/en/p/MOR122075
Link is:
https://www.napaonline.com/en/p/MOR122075