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Sorting Out the Lubes for a Harley-Davidson Dyna Wide Glide
 
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Question:
Sorting Out the Lubes for a Harley-Davidson Dyna Wide Glide
I have read your question and answers regarding oils in a Harley with separate case, trans, primary. I have been using Mobil 1 V-Twin 20W-50 in all three holes. I am all about optimal product use and performance. Aside from 20-50 V Twin in the engine from what I have read it seems like Mobil 1 Racing 4T 10W-40 for motorcycles would be better in the primary, and 75-90 gear lube would be better in the trans. Is this correct? 2002 Harley-Davidson Dyna Wide Glide. Also I see you have a 75-140 gear lube. The manual does not specify weights of oil to use and it's one of Harley's marketing schemes to make you buy their oil.
-- Michael Lawton, Howell, NJ
Answer:
We recommend that you keep doing what you're doing and use Mobil 1 V-Twin 20W-50 in all three applications. By using a premium synthetic like Mobil 1 you are already using a high performance lubricant in your bike. Using Mobil 1 Racing 4T 10W-40 in your primary is an option but we would not recommend the use of an API GL-5 gear oil in your transmission. (Also see the question on API GL-5 gear oils in transmissions.)
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