Interesting how Stewart-Haas leases engines from Hendrick and supposedly runs Mobil yet Hendrick themselves had Valvoline sponsorship in very early 90s and then Quaker State for an entire era, and now next season they have Valvoline on-board again. You would assume Hendrick is building these engines with their sponsor associate products (not like QS/SOPUS isn't up to the task) but this leads me to believe that either Hendrick uses M1 or Stewart-Haas doesn't actually use Mobil products. Hendrick leases the engines, I'm sure Hendrick specifies the oil.