If I were you I would do as mentioned above, go to Napa and get Napa full synthetic, it's actually Valvoline synpower full synthetic just in a different bottle, both made by Ashland and you will see it on the back of bottle, if you want to run it 5k use a mid level filter like a wix or Napa gold since you will be at Napa anyway, I'm not a fan of m1 but many on here like it, I think the Napa synthetic is just as good if not better just don't run it past 6k as the tbn usually isn't as good as m1.