From PlayStation Universe: “The Crew 2 where to find loot crates guide will bring the parts you need to upgrade and improve the performance of your vehicle. If you want to get ahead of every race, you will need a lot of gears and some mechanic skills to make your ride reach its optimum performance. You also need to know what parts are essential and should be prioritized.”
Source: N4G PC The Crew 2 Where to Find Loot Crates Tips