I use it regularly in my older cars, boat and other machines with metal fuel tanks.
A long time ago, when I first started driving and had a TR6, the local British car guru strongly recommended MMO, but not for any engine benefits. I grew up near the water and British cars of the era (I'm sure others as well) had an issue where the fuel tanks would rust at the high water mark especially in seasonal use cars. TR6's seemed especially vulnerable to this, at least that was my experience. The mechanic's theory was that the MMO in the fuel would leave a more oily film from sloshing then non treated fuel. This makes some sense to me and I have never had a problem w/ fuel tank rusting since then.
I have been meaning to test the theory with some bare metal strips hung in our lake house shed.
A long time ago, when I first started driving and had a TR6, the local British car guru strongly recommended MMO, but not for any engine benefits. I grew up near the water and British cars of the era (I'm sure others as well) had an issue where the fuel tanks would rust at the high water mark especially in seasonal use cars. TR6's seemed especially vulnerable to this, at least that was my experience. The mechanic's theory was that the MMO in the fuel would leave a more oily film from sloshing then non treated fuel. This makes some sense to me and I have never had a problem w/ fuel tank rusting since then.
I have been meaning to test the theory with some bare metal strips hung in our lake house shed.