Mobil 1 is easy to get and Sams sells a case of 6 for $23. I personally would rather change it frequently and make sure all the suspended particles come OUT of the engine. Extended drain intervals like Amsoil offers should be accompanied by regular oil analysis, something I don’t have time for. I’ve used Amsoil and think it is great, but expesive.

While racing jet skiis for over a decade, I used their 100:1 oil mix and never seized a motor - no other 2 stoke oil has ever come close to offering that thin a mix.