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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Today's Featured Article - History of the Field Marshall Tractor - by Anthony West. Any restorer who has some knowledge of turn of the century farm machinery, will recognize the name Lanz Bulldog!! This machine was to say the least unusual in its appearance. The huge flywheel and coffee percolator shaped exhaust. Along with square body lines and cylinder head protruding forward of the front axle. Would become the visual differentiation that people would quote to separate the Lanz from other period machines. The Marshall company based at the Briannia Works in Gainsborough
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