GPP Licensing Program

Testing Required for GPP Certification


Product formulations are tested against the Gasoline Protection Program™ (GPP) specification to confirm they provide improved oxidation/deposit control and water uptake prevention. They are also tested to ensure they protect against corrosion and do not contain certain heavy metals. Improvement of these characteristics may result in the significant reduction in engine component wear. Always check your owner’s manual to ensure you are using the proper additive product(s).

The GPP test suite includes five key performance tests designed to address:

  • Oxidation Stability
  • Corrosion
  • Post Separation Water Uptake
  • No-harm Metals
  • Deposit Control (only if claiming detergents)

Tests related to detergency certification will be satisfied via test reports provided from manufacturers/suppliers of the base additive(s).

The products are received by the Center for Quality Assurance (CQA) and then are blind coded with a sample ID.  The sample is submitted to ISO/IEC 17025:2015 accredited laboratories to ensure quality and consistency. The testing laboratories are approved by the National Marine Manufacturers Association (NMMA) Gasoline Protection Program.


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