To answer some of the comments: Big spur of 78. Obviously this depends from track to track, you must set the gear ratio for your particular track layout and this may change even within the same track depending on the new layout. Things to consider in choosing your gears are acceleration areas, difficult jumps that need to be cleared, true acceleration points on the straights, and motor temps for 6 min. Also different motors have differing power bands, so this also comes into account. For Beachline I am using a 6.1 final gear ratio after taking into account the transmission ratio. I found this gave me the best acceleration everywhere, and kept the motor running cooler allowing for a constant power delivery with no heat saturation fade.
You can achieve the same 6.0 to 6.1 ratio with a 70 tooth spur and 28 T pinion, but the difference is on how the motor accelerates within the areas of the track you need it to. With that said, choose a gear ratio for your track independent of what I am running. This is mainly for those racing at Beachline, in the 17.5 stock class on the current layout. With this motor, I started with a 70T spur and slowly worked my way changing the gears until I achieved fast laptimes, with the lowest motor temps after a hard 6 min without mistakes. Remember guys, I live in Orlando Florida, and it gets quite hot here in the summertime!
The 78 spur doesn't make it accelerate smoother, on the contrary, it makes the acceleration harsher or quicker! This is why I chose this gear since our track does not have long drawn out areas to accelerate. The current layout looks huge and long, but once you actually notice how long you are on full power, you will notice you need something that accelerates quicker, not slower with higher top speeds. Before you can hit top speeds with a small spur on our current track layout, you will have let off the throttle already to prepare for the turn. So the "lag" in your time to accelerate is transferred to the motor as heat buildup each time, since the motor never got to wind out. As the heat continues to build due to this heat saturation, your motors overall power diminishes, compounding the problem as the race progress's.

Regarding the shock oil, 27.5 wt AE oil is what I am currently using. Running the traxxas blue x-ring seals and green slime.