losi makes silicone shock oil at 50 and 60 wt. sparetime hobbies has it just down the road from old cedar speedway. if you want i can pick some up for you or you can order it from team losi or other hobby shops.
i picked up a bottle of 50wt for the front and 60 in the rear i used about 3/4 of the bootle for the shocks. a full bottle for the rears probly i run 4 front shocks on my car so i used a little les than you would.