Are there separate oils castrol universal by gl4 and castrol universal by gl5?
Answer from: Albert Rosenfield:
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Check this out. CASTROL SYNTRAX UNIVERSAL PLUS 75W-90.
The specification of the oil says that this oil can be used in synchronized manual transmissions, differentials and final drives of different types of equipment, i.e. in those machines where the use of a lubricant that meets the industry standards API GL-4 or API GL-5 is required.