Question about 2005 Suzuki Boulevard M50
NOOOO! Do not put 20w-40w in the final drive!!!
This bike has hypoid gears (beveled gears that create a sliding action across the teeth and therefore energy loss and a lot of heat). A 20W-40W oil will destroy those gears, it can't handle the high friction in the final drive.
You need an SAE90 Hypoid gear oil with a GL-5 rating as defined by the API (American Petrolium Institute) classification system. If you operate your bike in temperatures less than 32 degrees F (0 degrees C), you will need to use SAE80 GL-5 Hypoid gear oil.
Posted on Aug 08, 2010
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Posted on Jan 02, 2017
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