Want to know what's everyone's opinion is on what oil to use in a Raptor? I've been told many things but have heard to run with Castrol GTX 20W-50 in a Raptor. I know that car oil and ATV oil are different because of the wet clutch used on our ATV's but, changing it after a weekend of hard riding will not have an affect on things when running car oil. Does anyone know otherwise?