Several motor oil companies have similar warranties. Pennzoil has it for 300k regardless of what oil Pennzoil brand oil you use (so you get the full 300k even if you use conventional YB). Quaker State has a 250k mile warranty if I remember correctly. Havoline has one, but I don't think it covers DIY'ers, and there's another one I know I'm forgetting.
M1 has it, and I'm too lazy to look this up so please check out their website, but I believe they cover you any time you have M1 in your engine as long as you've been following the correct OCI and maintenance schedule.
Valvoline's warranty is nice b/c you can sign up for it up to 75k miles on the vehicle, I believe most of the others require less then 30k miles on the clock. Though Valvoline's "warranty" only covers you for 150k miles on conventional, and it's a bit of waste to go for the 300k mile warranty with synthetic b/c to maintain that you have to change it out every 4k miles (3k miles plus a 1k mile grace period they give you).
As much as I love finding what works best for me and my needs, I don't get bored sticking with it once I've identified what's best for me. I some what recently purchased a new car and am in the process of figuring out which oil works best with it, once I figure that out I'll stick with it. I have an old beater SUV, that car I don't mind changing brands and experimenting with
