Both WD40 and Marvel will affect the silicone ramping used in many race engines. In addition, removing your glow plug and/or air filter to use ARO when your engine is dirty is not a great idea. GMK Supply Afterlife ARO won't harm the silicone ramp, glow plug or anything else in your engine, and the syringe applicator allows you to add it by just pulling off the fuel line. Of course, I'm biased on the subject....
