Combine oil, vinegar, sugar, and soy sauce in a jar and shake until sugar dissolves.
Melt butter in a skillet over medium heat. Crush ramen noodles in package and discard seasoning packet.
Add noodles, almonds, and sesame seeds to the melted butter. Sauté, stirring frequently, until golden brown.
Remove noodle mixture to a plate to cool completely.
Shred cabbage and combine with sliced green onions in a large bowl.
Add cooled noodle mixture to the cabbage. Pour dressing over and toss well.
Serve immediately for maximum crunch.