SX2 steel idler grease?

[Cardnim]

Hey peeps,
Ive just bought the steel idler gear upgrade for my cat (from a ver nice oOpler ) but am slightly concerned that the new steel gears are going to run with more friction (and thus heat) than is good.

Is this a legitimate concern, and if so, should I lube them with something?

I use the Nuclear-RC greases and was wondering if they might be good for this?

Thanks!