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Stanadyne is the only additive approved by GM for us in in the Duramax engine and I run the Performance Formula.

Stanadyne Additives

Approved by Engine and Vehicle Manufacturers

Stanadyne diesel fuel additives have been tested and
approved by engine and vehicle manufacturers since 1993.
Ford, General Motors, Volkswagen, Navistar, John Deere,
Caterpillar, AM General and others have recommended
using Stanadyne diesel fuel additives in their engines or
vehicles.
 
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