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Seafoam is def sold in autozone, it comes in a steel can, with a white label, and I think red print. I can't vouch for the others you mentioned, but mystery oil is also sold to be used the same way as Seafoam, though Mystery oil contains other chems I believe, and it is red. So if you suck it in your brake vacuum line, you will be putting something I guess like red dye in your intake.
But it if you read the directions on Marvel Oil, it is to be used very similar to Seafoam, in same amounts.
But like I said, I don't think it is 100% petroleum like Seafoam, that said, I wouldn't hesitate to try it the same way as well, plus it is about half the price
of Seafoam. I'm gonna stick with Seafoam for the intake treatments though.
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