Canola oil is the Absolute best
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Canola oil (also called rapeseed oil in many countries outside the US) is usually recommended. It’s what the cast iron manufacturer Lodge uses to season their skillets.
I may be in the minority but i don't care what oil I use, I just keep cooking in it. I have used them all.
Ended up buying a refined avocado oil, I'm hoping it really is that and not a mix
Found this guide which suggest avocado oil: https://theflattopking.com/best-oil-for-seasoning-cast-iron/
I'm having trouble finding refined avocado oil though, all I can find is cold-pressed/virgin.
I've heard that a lot about flaxseed oil, it's really common. I've always used crisco, so I can't suggest anything else from personal experience. But this is a site I trust, and he has some alternatives on this page
I generally use Crisco, but that picture looks like maybe the oil was applied too thick? I get really good results with Avocado oil too. My process is to wipe the oil on with a clean cloth, and then try to wipe it completely clean. There will be a very thin layer still on the pan. I used to season in the oven at 500F, but I have lately had really good results on the range. I turn the burner up to high and let the pan heat until it is smoking, and let it smoke ~10 minutes. Once the pan is cool, I hit it with another thin coat of oil.
Maybe I did use too much oil initially, but I also think that since I kept using it while it was flaking it sort of got new layers of seasoning, but unevenly.