justin_o_guy2 wrote on 09/30/17 at 16:56:51:

ZDDP Boosters:  

Most of the wet clutch friendly ZDDP boosters will require you to internet order them as they are not stocked locally.  

Please note:  Lucas ZDDP booster which is stocked locally is not recommended by Lucas for use in wet clutch motorcycle engines.  
Ditto for Rislone ZDDP booster, Rislone won't recommend it for use in wet clutch motorcycle engines.
Both products contain long chain polymer ester thickeners which are bad for wet clutch function.

Here is the thread that the above text came from:
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1344471565

Here is some reading for you:
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1366651397