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Diesel Additives-All Season

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.