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What Oil to Use in Harley-Davidson Primary Drives
 
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Question:
What Oil to Use in Harley-Davidson Primary Drive
Hi, I have been using your Mobil 1 MX4T (Mobil 1 Racing 4T 10W-40) for 4 years and love it in my Japanese motorcycles. I have purchased a '08 Harley and want to continue to use Mobil 1 but use 20W-50 in the engine. What do you recommend I use in the transmission and the primary drive? I have no problem using Mobil 1 Synthetic Gear Lube LS 75W-90 in the transmission, but what do you recommend for the primary drive? Any other information related to this would be greatly appreciated. Thanks for your assistance.
-- Gregg Gillette, Charlotte, NC
Answer:
You actually have a couple of choices for the primary drive. The optimum product would be Mobil 1 Racing 4T™ 10W-40 but it is also okay to use Mobil 1™ V-Twin 20W-50.
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