I could use the help!
I've never heard of Royal Purple fuel stabilizer. I'll have to check it out.
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To the point, I cannot say RP MaxClean is better than Stabil.
I'm going by MaxClean's advertised ability to clean the fuel system, stabilize the fuel, and historically high quality products.
I have no hard data that it works better as a fuel stabilizer. I know it's about twice the price of SeaFoam - lol.
I always enjoyed reading and learning from the Greasy Spoon posts of jimmysidecar and the other expert comparing Royal Purple and Amzoil products. Great stuff.
IDK, maybe I watched a few videos of comparisons that convinced me too.
I put MaxClean in the fuel of every ICE I own.
SeaFoam may be better, less expensive too. Actually, SeaFoam has some added advertised benefits over MaxClean.