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"The mechanic(s) removed the head multiple times? That's ridiculous. If it truly needed to be removed a second time it means they didn't do the job right the first time."
We found the valves kept sticking and could not be unstuck even with can(s) of sea foam/MMO in the gas. Basically discovered it's a problem with A4 engines.
Thus the multi removal.
I shut off the water before i shut off the engine, replaced the little purge/siphon valve under the sink and fog the engine after each use.
Hope this helps.
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