Schaeffer’s 139A SoyShield® fuel additive is a way to boost diesel engine performance.
Schaeffer’s 139A SoyShield® is made from soybean oil. This fuel additive is a great way to boost diesel engine performance.
SoyShield’s® gentle cleaning 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. Then they can be burned cleanly and completely. SoyShield® meets DW10 specifications.