Refinery Lubricant Regeneration Case Study CONTEXT & OBJECTIVES Operator: A large European refinery operating a turbine and two critical process gas compressors.Issue: ISO code drift from 17/16/15 to 20/19/18, initially misinterpreted as particulate contamination. Standard diagnosis: MPC value considered acceptable; no abnormal wear detected; full system flushing recommended. Objectives: Identify the true root cause, characterize degradation byproducts, and avoid unnecessary system flushing. FINDINGS