AUTOKING THERMOLUB SYN 550 and AK THERMOLUB SYN 600 are fully Synthetic, high performance heat transfer oil intended for use in closed, indirect heating. AK THERMOLUB SYN SERIES Oils are formulated to resist thermal cracking and chemical oxidation which in turn can make a longer service life.


  • Proprietary Grade


  • Maximum operating temperature is higher compared to heat carriers based on mineral oil

  • High viscosity index

  • Low pour point