TRIAX Agra STOU 10W-30 API GL-4 Super Tractor Universal Heavy Duty Diesel Oil. TRIAX Agra STOU is a premium, multipurpose, one-fluid lubricant engineered for heavy-duty diesel agricultural engines. 10W-30 CI-4 DIESEL ENGINE OIL: Serves as a 10W-30 CI-4 diesel engine oil with an exceptionally high TBN of 15.
