lock plus

SoyShield All Season Diesel Additive

Made from soybean oil, Schaeffer’s 139A SoyShield® fuel additive is a way to boost diesel engine performance. SoyShield’s® gentle solvent action keeps injectors free from deposits, gum, and varnish that cause inefficient operation. SoyShield® disperses existing deposits throughout the fuel system, safely removing them to the combustion chamber where they can be burned cleanly and completely. SoyShield® meets DW10 specifications.