Welcome, always changed with RP since day one, even if GM offers the regular Dino for free. I aways said RP took out the DOD shake after first change. http://www.royalpurple.com/theforumwars/
Forum Wars should have a bout against a G8 GXP vs Charger SRT8
same here, I have used RP for a while with several vehicles. At the end the first oil cycle in the G8 i had a lifter tick after a cold weather snap. The RP took care of the lifter tick and so far haven't heard it again.