injector

Which one should I use? They both have techron in them. Which one does Hyundai use? I know one is stronger than the other. I have a 2013 sedan 3.8. Is the fuel system cleaner too harsh? I know some people say not to use seafoam because it can mess things up. Thanks for your help!

Picked up a 6-pack of Chevron Fuel Injector Cleaner with Techron at Costco today. Price was $13.99 after $4.00 instant rebate at register (no coupon required). Not sure how long this deal will last. Costco membership required.

The check engine light on my 2012 3.6 base genesis kept coming on and flashing. Each time I would bring the car in, the dealer said that there was cylinder misfires, but could not figure out the reason for these. First visit they reset the codes and said bring it back in if it happens again...