guys im sure this is a thread that has been posted before and if so correct me and i'll follow the link. In the CRF450's has anyone found advantages/disadvantages to running full synthetics as opposed to semi-synthetics? I've heard stories here and there that full synthetics have caused the CRF to burn a slight amount of oil. Is there truth to this.......I'm not sure just asking. Any experiences with this will be advantagious. thanks