Sonny, there are SOOOOO many additives out on the market today and not ONE of them does any good. Walk into your local auto parts store and look at the chemical isle and you'll see oil additives, power steering additives, fuel additives, everything from seal expanders to stuff you pour into your carbutetor to "renew" your engine! It's ALL crap and just another way for corporations to separate you from your money. This junk generates billions for the manufacturers so why should they stop?!
Fuel additives are the worse in my opinion. They toute "cleaners" you add to the gas tank to clean fuel injectors and show these great pictures of "dirty" injectors and then "clean" injectors after using their product. What a load. Modern formulated fuel already has additives that clean the system. No reason to add anything else, but how many people do you know that pour a 12 dollar pint of that junk in at every fillup!!
Spark plugs are another irritant for me. Dual electrodes, quad electrodes... They perfom NO BETTER than the standard single electrode spark plugs. Electricity takes the path of least resistance and that means the spark jump from the center electrode to the ground electrode will be across ONE, not four! It's like razor blades. 3, 4, 5, 6 blades... when will it end??? I'm sure some day we'll see 24 electrode spark plugs and 24 blaze razors!!!
I'll step of my soapbox now, but hopefully I've saved someone out there a little $$$