I would not pull from my emergency fund for what's ultimately a toy. Should I have the same view of my 401k?

I should have clarified its a private party sale of a very in demand "classic" 90s vehicle which should not last more than a couple weeks for sale, which is why I can't rely on saving a few months

It's a private party sale, which I could get a personal loan for at probably 10% interest and hit my credit report, whereas with the 401k loan I am paying myself the interest and the loan does not affect my credit