Big problems if it sets around for months before being used.
Impressive by having seen the results in real life. I'm one of those who don't go by what I come across on the internet, or even the manufacturer's claims. Instead I use products and see what happens.
You say that there will be problems with gas after months. Okay, it doesn't say two or 36 months, but I'm guessing you meant less than a year. Meanwhile, after two years I found no evidence of stratification using StaBil - which I have since stopped using after trying Star Tron.
But, that gas had definitely lost some of its luster...which at least partially came back after using Star Tron. Our Can-Ams actually prefer older gas and starts much better. That's with up to six year old gas, but it has been kept in air tight containers, then got some Star Tron added about 24 hours before being used.
Another vehicle that's easy to judge good or bad gas with is a Toyota 3-cylinder that I drive just about daily. There's something wrong with the EFI so it doesn't start well even on a good day when it's cold. Real life experience, again.
That tank with StaBil was 91 octane ethanol free, by the way. The current content is basic regular, now a bit over two years old. Nothing is the water separator filter (yet anyway) and the vehicles like it better. But, I have also eliminated the vented cap on it, which really seems to help.
Bottom line: No problems after two plus years, let alone big ones as mentioned above.
And several of our vehicles can sit for over six months with gas from gas stations (nothing added) and they still function just fine.
