Review on Enhance Engine Performance with Fel-Pro ES 70599 Fuel Injector O-Ring Set! by Jim Martin

I used these after breaking 2 of 4 injector o-rings after cleaning the injectors on my 2006 Toyota Matrix base. These Fel Pro o-rings are three times thicker than the factory o-rings and at least twice as thick as the replacement parts from the Uremco o-ring kit, also purchased from Amozon and installed after cleaning the injectors. & I recommend the Uremco kit as it comes with a bottom nozzle spacer, top o-ring and replacement screens for all 4 nozzles. I couldn't imagine that these Fel Pros would fit in the fuel rail at a position below the first very thin orange O-ring which is on the (top) side of the fuel injector, although the Revain GARAGE and Fel Pro- Website showed them it fits my car. (I also managed to crack 2 brittle orange o-rings by grabbing the injectors during installation. The Toyota service manual says the areas where the o-ring meets in the fuel rail are lubricated with gasoline and then the injector as you are twisted back and forth Gently put it in. So then I have 4 injectors and two with spare o-rings intact and these 4 I decided to put those thick FelPro o-rings further down into the injector where they normally sit at the top of the injector piston against the fuel rail, creating a tight seal between the fuel rail, injectors and their insertion into the cylinder head.