You are right:artificer wrote
Aviation fuel, kerosene, diesel & home heating oil are ALL middle order distillates, are they not?
From the heavier to the lighter : asphalt base, industrial oil, home heating oil, diesel fuel, jet/aviation fuel, gasoline, LPG.
That's the reason why I'm interested in the TCW3 oil or Lucas additive. (Lucas products have a very good reputation)
They both contains a distillates with lower volatility, i.e. the aviation fuel.
I'm not a specialist in petroleum products and that is the reason of my question regarding you experience with additives or 2 stroke oil.
To me that's logical to add a less volatile distillate (jet fuel) so that the product/oil will not be completely burned in the engine.
That will contribute to the lubrication and to the surface protection against corrosion in the top cylinder and valves areas.
Yes the ethanol (alcohol) is highly hygroscopic.
When the ethanol/fuel mixed is saturated with water (above 0.6%), the water settles into the bottom of the tank or wherever the is fuel in the fuel system (fuel pump, carb bowl...).
The temperature is a critical factor.
The scenario is the following:
You fill up the car or gas can with fuel with ethanol that, for different reasons, is near its water-saturation point and at 15°C/60°F.
Overnight, the temperature drops by only 7°C/20°F, and all the water and alcohol settle out everywhere in the fuel system .
Guess what? The engine won't run very well when the fuel pickup is sucking up the alcohol–water mix.
Guess what? If you don't use your engine during a while. It will be corroded from the inside like a cancer.
To resolve that last issue, I would run the car with ethanol free fuel prior to store it in the garage during the winter season.
And that's not finished with the alcohol nightmare:
Alcohol is corrosive and can degrade plastic, rubber or even metal parts in the fuel system that weren't engineered to use alcohol-bearing fuel.
Alcohol will also scour varnish and deposits out of the fuel system that have remained in place for years, which will eventually wind up in the filter or main jet, choking off the engine's fuel supply.
Worse yet, the alcohol itself oxidizes in the tank and will gum up the fuel system.
That's what happened to my old tiller engine earlier this year.
I had to completely cleanup the rusted fuel tank and coat the tank wit a special Restom 2 components epoxy.
I had also to clean up the carburetor from the heavy brown gum deposits.
I've also seen that the inside of fuel bowl was starting to be corroded (white corrosion inside)
Hopefully there was no plastic or rubber in the fuel line.
Also I've found an interesting study made in Portugal regarding cork gaskets in contact with ethanol fuel.
What will happen with that cork becoming black where in contact with the fuel+ethanol? Other engine parts "horror pictures" with ethanol
Carb float gummed up: White corrosion Cylinder wall corroded Yves