My oil line have a tiny leak and im wondering if it okay to use that? would the oil pressure go down a lot?

 

you'd probably be better off fixing that.

 

i plug one end and blow through it, air escape VERY slowly and i dont think that the oil would leak but im worry about lossing oil pressure.

 

Is it your feed or your return line? Return line I wouldn't worry too much about, but the oil feed is under around 50-70 psi of pressure (I think) That pressure adds up and will cause you to lose a lot of oil and will eventually widen that hole.

 

it not a hole, it a thread hole where i srew a bolt in but it leak very little for some reason...