if you do site inject an area, the oil itself will cause the muscles to stretch out with oil.
This may cause the body to help the area to grow a bit quicker.
I have read alot about this subject in the past.
Paul borrenson used to talk about it quite a bit in his books. He also talks alot of using synthol (site enhancement oils) , to stretch out muscle tissue so it will help it grow.
He also feels that if you are going to be shooting oil into the muscles themselves they mine as well have gear in it anyways.
So in threory it may work if done correctlty and in large volumes at a time.
I have done it myself in my biceps and have gotten success from it.
Lots of pros these days do it all the time in lagging bodyparts.