Oil filled shocks on RC's this small, especially crawlers, is absolutely pointless. The whole reason for oil in a shock is to help control the bumps your car takes at speed. It only hinders performance in a crawler this size because you'd basically have to use alcohol to even be close to proper...
I agree. The SCX24 Deadbolt is the most capable one we have had out of the box. And the amount of hopups for them is ridiculous. We've yet to grab the AX24, but it looks like a really fun one to play around with.