Could anyone give me a suggestion for LOD level?

Hey everyone,

I have a car mesh which has 30k tris and 4k textures. I want to make some LOD level for the mesh. I need a suggestion. How many LOD levels should I use for a good optimization and how should LOD level be created in terms of number of tris, texture quality and LOD distance? At the runtime, there might be 10 cars in the scene.