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I decided to compare it to the new Wells part I had on the shelf and it is identical to the OEM Honda. The markings are all the same, the Honda part number is on the Wells part as well. Everything about it looks identical.
I have seen this lots of times with Wells, same markings and numbers as OEM delphi on a GM EVAP valve, the thing even had the same molding machine marks. I think Wells maybe just a re packager of OEM these days.
The 05 Honda i did was stained so deeply that only scrubbing with a very stiff parts brush and the most aggressive chemical would shift it.
I did note that on steel parts the varnish was gone so anything functional was clean. Problem was the passages were all plugged up with sludge also.
That poor thing was beyond the help of any additive.
The problem with aluminum is that it can be so porous that sometimes fluid can actually leak right through it leading to TSB's for case porosity.
This means varnish can be so deep in the pores that there is no real way to remove it easily in a running engine.
Even if the chemical softens it the oil must still be able to wash it away.
Maybe over a long period of time PU may actually shift it i don't know but i wouldn't worry about it if its running well.
I would say run the PU as you plan and keep that PCV changed once a year, use the Wells by all means if its the same part#, chances are it is OEM Honda.