Green Earth's, QT, Bar & Chain Oil, Reduces Friction & Prolongs The Service Life Of Bars, Chains, & Sprockets By Resisting Oil Thrown Off At High Chain Operating Speeds, Prevents Rust, Resists High Temperatures & Flows Freely At Low Temperatures, Not Suitable For Internal Engine Use, G-Oil Is 100% Biodegradable & Completely Safe For The Environment, Must Biodegrade 60% Within 28 Days.