Good oil of any kind is pricey. We personally run the Amsoil/Briggs 4T in our two 206’s as well. We also road race them, so they’re getting a good workout every time they’re on the track. As a note, we also use Motul 2T in our X30…works great, burns clean, lubs great, and they don’t give that away either $$$!!!
There’s another forum on Bob’s four cycle page where this kind of info is discussed at length, including several engine builders. They all agree that you can’t go wrong with the Amsoil 4T. Though some folks do run different oils, they are all of very high quality.
The logic is it’s developed for high temperature (air cooled motors run hot) with a splash oiling system (rod/crank slap the oil at the bottom of the stoke creating some sort of crazy splashing mess). Automotive oils don’t see those kind of conditions and may foam which cuts they’re lubricating ability. I’m no expert, but it makes sense to me.
I know what you mean though, you change the oil and it comes out looking almost new! Every time you feel like you’re throwing away 7 or 8 bucks!! I get it, but compared to all the other expenses associated with this sport, why save pennies. I’m sure Mobil 1 might work fine, but you’re only saving a couple bucks per change.
Like I said, I am no oil expert, but following your engine builders recommendations is usually a good idea.
Have fun,
Clark Gaynor Sr.
