ur bio-stable technology has evolved from the high quality Water-Soluble Oils (high oil content) into Semi-Synthetic (low oil content) and Full Synthetics (no oil content). Hangsterfer’s only uses highly refined, ultra -pure ingredients. All of Hangsterfer’s Coolant Concentrates are formulated with advanced technologies, which utilize synthetic, vegetable and petroleum components. We do not use Diethanolamine (DEA), which is the leading cancer risk associated with the use of coolants.