Not Ranked
I don't think you really notice it when you have a big starter and eight cylinders working for you. I've used SeaFoam in the gas on my Harley and it does make a huge difference in the idling and starting. I don't use it all the time but every 4 or so tankfuls. In the past 2 years I've been using it it's made a big difference. I also threw some in my X-Terra and it cleared the "cat" code it was throwing.
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