I used to be an Amsoil dealer, and firstly I must say that they make very fine products, some would argue they make the best products. Others would say differently. I'm not pitching either arguement, you can make up your own mind.
Anyway, after a couple of years of use in various vehicles and applications, I took a real hard look at what I REALLY needed, compared to what I THOUGHT I needed.
In the end, I decided that I was spending a lot of money (even at cost it was expensive) on something that I got no benefit from over "store brands".
Does Amsoil deliver what they promise? It appears so.
Do you really need it? Probably not, but it certainly won't hurt to use it if you want to.
The other main thing that turned me off was the fact that it wasn't readily available on store shelves. Something an RVer should consider when switching over to it.
Well...there it is...my honest opinion.