10w40 would be Motul 300v (lol $120/5L), Motul 4100 turbolight (semi-synthetic), Sougi Syn-x (semi-synthetic), sougi m5000 (I think it's 10w40, but it's mineral-based semi-synth apparently), or Nulon somethingsomething "100% synthetic" lol
those are just off the top of my head, there'd be other brand options out too, but I don't know of them tbh