Couldn't find AutoRX in a store locally so I picked up Marvel Mystery Oil instead. Can I use
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Piston soak is poured into sparkplug holes 2-3 oz with a solvent and let sit after cranking without plugs (no hydrolock, towel over holes). Also mixed with seafoam/berrymans during the intake clean, load it up with MMO and turn the engine off. Let that **** soak in and then finish the treatment with solvent (seafoam).
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