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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

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What type of oil should I use?

S&S recommends a premium brand of 20W50 oil formulated specifically for motorcycle use for all Long Blocks. 

In Shovel-Style Long Blocks, 50 or even 60 wt oil is usually acceptable in hot areas where temperatures below 75° are seldom encountered. 

In S&S' experience it is best to break the engine in with petroleum-based oil and, if a synthetic oil is preferred, change to synthetic after break-in.