XL-5 HPI Firebolt 15T
You will need some shock oil for sure. The stock caps are prone to popping off. You can probably just fill it with oil and thread it back on and be good to go for now until it pops off again. The fix is to buy aluminum shock caps and the problem will go away or you can opt to buy Big Bore aluminum shocks or any number of after market aluminum shocks as an upgrade.
Rusty - MERV - Pede 4x4-Alias
SPC Lipo Power
I'd just go with aluminum shock caps, it would be the most cost effective. When I get new Traxxas (Brand new, or new to me), the shock caps get replaced before I run, its not an upgrade, it is a necessity.
Submarine Qualified, Chief Inducted, Navy Retired