50-55 is too much for a revo outdoors IMO. That's the kind of oil you would use indoors because it's much smoother and less bumpy. Outdoors you get ruts and pits and whatnot, so thinner oil is better. You want to absorb the bumps otherwise the truck becomes very twitchy and harder to drive. 35 is what I run, along with the orange and gold springs. I also set the preload at slightly above bones level in the front and bone level in the rear.

Do not get hung up and having the fast car out there!!!! I can't stress that enough. The fastest car in the world won't do you any good if you can't drive. If you wanna go fast, practice, practice, practice.... it's the only way. Stay smooth and don't crash is the ticket. It's much easier to do with a slower motor that's easier to control than a high powered .18 or bigger motor, IMO. I should know, I was faster this last winter at indoor LH with a 2.5R than with the 18TM. I has less power, but I also made less mistakes, which more than made up for the power difference.

Also, I recommend getter a stronger servo, and putting the heavy duty servo saver spring that traxxas offers for the revo. Your steering will greaty improve. You can never have enough steering .