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My 65 uses 80w 90.Has since new.Every one Ive had had the same.Ive had my 65 since 69.Drove it in the winter for years and never a problem.Rocky



I fully agree with the 80w-90. Also make sure it is GL-4 Rated NOT GL-5. GL-5 has too many friction modifiers in it and will not let the syncro grab the hub enough to slow the gear down. GL-5 is made for rear ends.