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I also noticed a bit of smoke (like what comes out of this hose) coming from the left side of the back valve cover area.
The hose in the video is your 'crankcase breather hose'...it works in conjunction with the PCV valve (which is what you may be referring to at the left side of the rear valve cover emitting the smoke) to flow air through the engine, removing harmful gases that get built up from the hot oil and pressure, then safely burn them in the in the combustion chamber and exit them out through the exhaust....I think? :dunno:
 
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