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Just called local bike shop. Harley installs convetional 85/90 gear oil purchased from cheapest supplier. Harley does not make their own oil they claim has to be used in their bikes. That info. was obtained from an Amzoil web site. As an Auto Tech. of 34 years I know that different oils are used for different applications for a reason. The use of synthetic or conventional oil should be based on facts not opinions!

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13y ago

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