Question: Can I use Spectro’s Heavy Duty Platinum 6-Speed Transmission Lubricant in either a 4 or 5-Speed transmission?
Answer: Yes. While the 6-speed transmission lubricant was designed for the newer Harleys, and after market transmissions such as Baker Drivetrain, it incorporates extreme pressure additive technology not required in the older 4 and 5-Speed transmissions. Therefore it meets or exceeds the requirements for older transmissions.
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