Feiyue FY-01/FY-02/FY-03 WLtoys 12428 Upgrade Front Shock Absorber 01 35 RC Car Spare Parts
A part of the review has been auto-translated.
The shock absorbers come dry, without oil, and without lubrication! Under the black cap there is a seal and two O-rings, but they are completely dry - and give a very high friction. After lubrication - the shock absorber almost does not absorb in the entirety, only resiliently, it must be primed with oil. Without lubrication - the o-rings are very stubborn and will wear out quickly. The shock absorbers can be filled with oil, then they dampen significantly.
I have only partially upgraded my car yet with metal parts and I think mixing the two version is not the best. This front shock absorber at this point is not better than the original one. Together with the original plastic claw the damping factor is to high for the weight of the car in this setup. The wheel arms practically do not move up/down . I hope when all metal parts has arrived, and applied it will be better. Till that time I use the original ones. The first two picture show compared the state of the two type of the absorbers compressed and released. The third shows that the partially upgraded side takes a different base position than the original one.