Maxima's Castor 927 is a castor based, ester-fortified 2-stroke engine oil designed to ensure maximum performance while providing maximum protection under the most severe conditions. Carbonization and vaporization resistant formulation combines surface-active esters with a highly-refined castor oil to provide excellent film thickness and surface tenacity, protecting cylinder walls, journals and other critical areas. Proprietary ash-free additive system keeps your engine running clean and free of gum formation, corrosion and deposits.