someone posted this from 2/09 from this website - Cleaning a Motorcycle Chain - webBikeWorld

Further below is the entire response (from WD-40), but here is the meat of it:

"It is possible that if there is a special lubricant in the o-rings, WD-40 could act as a cleaner and remove that oil. The special lubricant would be replaced with WD-40. We are sure there are superior heavy-duty chain lubes on the market."

'nuff said. Thanks for all you do!"

"Thank you for contacting the WD-40 Company with regards to using WD-40 on o-rings. WD-40 is a multi-purpose light lubricating oil, which will displace water and moisture from the chain. The "WD" stands for water displacement and acts as a rust preventative on any metal surface. WD-40 will not dry out the rubber o-rings. We have found no visible effects on the surface of rubber and o-rings. Certain types of rubber will swell under prolonged immersion in WD-40 (this refers to long soaking and not just a spray).

WD-40 is also a cleaner, which will remove grime, dirt, tape, bumper stickers and oil. It is possible that if there is a special lubricant in the o-rings, WD-40 could act as a cleaner and remove that oil. The special lubricant would be replaced with WD-40


We are sure there are superior heavy-duty chain lubes on the market. There are several people who recommend using WD-40 on their chains. Perhaps some experimenting with WD-40, as a water remover and rust preventative followed by a heavier chain lube would fit your needs. The bottom line is WD-40 will not harm your o-rings, but it could remove a lubricant that was previously applied to the chain.

Thank you again for contacting the WD-40 Company. Please let us know if we may be of further assistance."