Hello. I bought my 2001 I30 which came with 18 inch 2009 M35 wheels. Upon changing my tires, I saw they had just normal lugs on them. Do they require the washer lug nuts like those of g37 wheels? I bought a set and tried one on but the washer was still loose after I tightened it. So I just threw the old lugs on again. What lugs do I require? I do not want to lose any wheels. Thank you.

Yes defintily get the g37 wheel lugs I had this same problem the stock lugs in these wheels will also eat them away

I already bought g37 lug nuts and the washer stays loose. Even though the lugs are tight.

Had the same problem with my g37 wheels the old lug nuts were eating the metal of the lug nut holes . Got the right lugs so as long as it sits flush and feels tight the washer should not be a problem.