Searching through the 100 tech forum didn't show much discussion on this. I'm talking about additives like ATS 505 and similar. My gut tells me its probably not needed and maybe could cause isseues? I also figure an '03 LX is old enough that it shouldn't get as much buildup as a newer car. I've changed my oil regularly but I don't know how often it was changed by the prev owner (I've only had it 15k miles). Trying to be proactive in case there's some buildup. Thoughts?