I think it has been out for a few years actually, never really caught on though. Instead of 25% why not 100%? I use Renewable Lubricants (RLI) and love it. 100% plant based ester oil and it is crazy how good it runs in a lot of engines here. A bit costly but I find it worth it. I have a 5 gallon pail of the 5w20, and probably 40 quarts of some of their other oil grades (w30, 5w40, 15w40, 10w30, 5w30, ect.)