I need to oil my crossman storm xt...?

i have no idea where to put the oil.i've shot with this gun well over 2000 times.the manual said to oil it every 1,500 shots.i think...i lost it.Theres no opening for oil to be put in...i was just thinking that i should just put oil on everything that moves,but its prolly best to know for sure,just to be safe.