So I need to put some more lubricating oil (into the castings, not the damping oil in the cartridge) into my travis, but my question is, do I HAVE to use the stupid motorex semibath oil that costs more and I have to wait for, or can i just go pick up some fork oil of the weight of my choosing at my local moto shop? Or is it gonna screw up teH fork? Keep in mind its on the left (non damper) side.