The oil helps to control the compression and rebound speed, springs keep it off the ground. You'll only be able to go so heavy on either till it handles like it's got no suspension. If your running the factory fluid you'll likely see marked improvement with the 50 weight, but I personally wouldnt reccomend too much heavier then that for a basher. The shocks need to be able to react fast enough to absorb the tough terrain, but soft enough to allow the springs to maintain ride height and keep the tires in contact with the ground as well, and all this has to happen at the same time. That's why a lot of shocks (automotive, offroad) have variable calving built in them. To try to get better rebound vs compression rates, and even cycle speed can effect how the valve works. Here we have static holes. No valves or the like built in. So were really just trying to find the happy medium, as fluid cant compress (for all intensive purposes) and can only flow X amount through a given restriction at a time.