1. Scope

Keywords

Rationale

The Thermal Oxidation Performance Protocol (TOPP) is proposed as a distinct method because it addresses the need for accelerated and reproducible aging assessments that incorporate deposit-control metrics rather than relying solely on sludge evaluation. TOPP uses controlled thermal-oxidative stress conditions and applies endpoint-based termination criteria, such as viscosity increase, acid number, deposit rating, and other guideline recommendations as specified in ASTM D4378, to accommodate formulation differences and support risk management. This approach ensures that oxidation stability testing reflects performance requirements and provides actionable insights for lubricant development.