Correct adjustment of the oil tip is very important and is a determining factor in applying a consistent oil pattern.

There are two adjustments that can be made to the oil tip. One adjustment is the height of the tip in relation to the transfer brush.  The other is the position from front to back. 

Ideally, with the buffer brush in the down position, you want the oil tip to be around 3/16" up on the transfer brush from where the transfer brush meets the buffer brush. 

To adjust the height, adjust the stop collar on the assembly. To adjust the front and back position, loosen or tighten the adjustment screw located on the back side of the oil head assembly.

If after you make this adjustment and you see zig-zag lines in the oil pattern, you most likely have the conditioner to low on the transfer brush not allowing the oil line to smooth out.