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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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