inconsistent heat

[LightlyToasted]

Valve brand was SKP purchased from RockAuto 2 years ago. I typically never purchase cheap parts, so I cannot explain why I had bought the cheap SKP (maybe the others weren't in stock or something).

I have ordered a Beck Arnley replacement for CAD160 from RockAuto. I would have preferred Bosch (OE) or Mahle, but I cannot get one quickly enough, and it's not a great idea to go without heat in Canadian winter. FWIW, if you're willing to wait for the slow boat from China, you can get a Mahle valve for CAD70.00 including shipping via eBay. Local parts stores (Napa, etc.) were outright thieves, wanting CAD400-600 for off-brand crap. BMW genuine part from the dealer is about CAD240.