^^^ What he said, except that you don't even need anything more than regular oil as long as you keep up on your oil changes.
Fluid additives like oil treatments, fuel octane boosters, and coolant chemicals are only out there to suck money out of people that don't know anything about cars. They put all this stuff on the bottles about how this increases by x% or wear is redused by y%. It's all BS.
Just stick with factory recommended fluids and standard parts for maintence needs.
true true, ive worked at autozone for 5+ years. and so alot of research of all the products ive sold. the actual helping percent or % of active ingredient that is GOOD for the car is VERY minimal. the car is new. stick with the factory fluids and things, a nice synthetic oil like Mobile 1 is a good choice. these other products do not protect against wear they take cars that are already worn out and give them a little life line. i do not recommend for new vehicles.
if you wanna do your car a favor, change the oil to Mobile 1 and run a take of high test fuel every once in a while.
Yea dont use the additives in a new car like in the Scion. However for older cars (15+ years old) I do recommend Lucas additive. The people I saw that rolled through this summer with 200000+ miles on their car, were religious about oil change timing and quite a few used Lucas once the car got high mileage (150000+) . For your Scion, dont use it. Itll only make things worse at this point in the cars life.