Yea I read the labels, yellow is meth red is ISO hence the name ISO, but it is labeled as fuel injector cleaner as well. I don't think they would market something that did nothing when they have another bottle already. So far it seems to be doing what it's supposed to, I will most likely switch to the yellow anyway after another bottle of the techron concentrate plus. Btw anyone have the BG injector service done and how much? The Chevy dealer here that does it quoted $210, that seemed rather steep
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