I've been using Gumout Regane in our vehicles for a couple of years now, putting a bottle in the tank at each oil change. I'd bought a bunch of it at Big Lots for $2.50/bottle but my stash is depleted. I'm changing the Nissan's oil this weekend and am trying to decide between Techron which is $6.50/bottle with AAP's BOGO deal or Gumout All-In-One which is currently $6.99 at O'Reilly. Help me decide. Which would you choose and why?