100LL is a blue transparent fluid that high is in octane and still contains low amounts of lead in the gasoline. We have many questions on what is in our fuel, so we want to give you the most information possible before you make your purchase. Please click on the link for more additional information on what 100LL fuel is and how it came about.
"...The oil companies found that they could still meet the 100/130 octane specification with only 2 grams of lead per gallon if they increased the severity of the refinery process and topped off the blend with toluene concentrate.
A new product and a revised ASTM D-910 spec were born. To differentiate the new 2 gram limit fuel from the old unlimited lead level fuel, they chose a new color, blue, for the product. It seemed too confusing to have a 100/130 and a 100/130LL, so they started calling the new product 100LL but the new product still met the same 100 lean rating and 130 rich rating octane requirements as the old 100/130 fuels..."
-Ben Visser