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Mobil1 V-twin 20w-50 in my engine and Mobil1 75w/90 gear oil for the tranny will work fine, or buy the 32 oz's for the tranny at your HD dealer.

Don't use trans oil.

Sportsters use H.D. primary and transmission lube. You can also use 20/50 H.D. oil. Don't ever run your sportster without transmission oil!

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9y ago
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Q: What weight is transmission oil for a Harley Sportster?
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