the weights given r new to me i am a beginner to rc nitro and was wondering what if any r equivelent to 75 wt diff fluid or 80 wt what is 7000 3000 and 10000 i know they r diff fluids but what is comparable or not.also red greese are we taliking autom otive or rc speciffic .last question how do i tell if my shocks were filled at the factory or not .
thanks for the help in advance

earthquake 3.5
e flight msr
elight      sr