I actually just picked up 6 quarts of Formula Shell 5w30 for $1.99 a quart so I poured it in. I use the Motorcraft in my wifes 5.8L Ford Bronco and the Pennzoil in her nieces Corolla. That put a dent in the stash but I was happy to help! Once I was done I filled up on Shell 93 octane for the weeks commute.