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Does Mobil 1 Synthetic Gear Lube Corrode Yellow Metals?
 
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Question:
Does Mobil 1 Synthetic Gear Lube Corrode Yellow Metals?
Is Mobil 1 Synthetic Gear Lube LS 75W-90 gear oil OK to run in Harley Transmissions? The big buzz on the internet chat rooms is that it corrodes "yellow" metals, such as brass and copper. Is this true? Please answer THIS question.
-- Michael Carravetta, Janesville, WI
Answer:
Unless the transmission specifically recommends an API GL-5 fluid for your transmission, it should not be used. GL-5 gear oils are designed for gears that require a high level of EP (Extreme Pressure) additives to protect gear teeth under extreme stress. Unfortunately, these same additives can be very aggressive toward “yellow metals “and are generally not recommended where copper, brass and bronze components are used.
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