Castrol GPS

GUIDE TO HEAVY DUTY PRODUCTS AND SERVICES

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Background & Properties Industry Specifications History .......................................................................A2 API CK-4 and FA-4 Background ..................................A3 API CK-4 and FA-4 Engine Tests .................................A4 API CK-4 and FA-4 Bench Tests ..................................A8 Other OEM Specifications ........................................A12 The API Service Symbol ............................................A14 SAE Engine Oil Viscosity Grades Physical Requirements ..............................................A15 Comparative Viscosity Classifications ........................A16 Important Engine Oil Properties Role of Engine Oil ....................................................A17 Base Oil ...................................................................A18 Base Oil Groups .......................................................A20 Base Oil Groups: Characteristics ...............................A21 Refining Techniques .................................................A22 Additives ..................................................................A23 Viscosity Index – A Measure of Performance ............A24 A Engine Oils

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