A: It is always good practice to fill your new oil filter with oil before installing. If there is no oil in your filter, you only have air. Your oil system does not call for air, only oil. It is unfavorable to have air in your system, as it may disrupt proper circulation. If this can be avoided, it should be. Like we said: it’s just good practice.
Harley-Davidson Oil Change & Transmission Fluids http://www.fixmyhog.com/video/oil-transmission-fluids-001266/