Heavy Duty V-Twin Gear Oils include some of our best reviewed products. The most iconic being, Heavy Duty Platinum 6-Speed Transmission Oil, which is tested and trusted by industry professionals like Baker Drivetrain. Spectro offers many Heavy Duty gear oils that are purpose built. Lubricating gearboxes pose different and unique challenges but our proprietary additive packages and formulas offer protection and fuctionality in transmissions, primary chaincase and gear applications.