Did they mention what class of oil to use? IMO that would be a lot more important than viscosity alone. GL-4 & GL-5 are the current classes, GL-1-3 might still be available in certain brands but these classes are out-dated now.
GL-4 and GL-5 both have EP additives, the number correlates to the amount of EP additives, higher class number = more EP additives. GL-4 and GL-5 are interchangeable in most applications. Most of the time when GL-4 is specified, its for gear boxes/transmissions with synchronizers or bronze/brass bushings. Too much EP additives can attack bronze/brass and cause wear. If no GL oil class is specified, it probably doesn't matter which you use. There is very little concernable difference in 80w-90 vs SAE-90. If classification is not specified I would just buy one viscosity for both (80w-90 in either GL-4 or 5)
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