burn out problems
If you want to get both to spin, try the nice slick asphalt surface common in parking lots. My 00 E55 will appear to spin both tires everytime in this situation, but with a decent surface - rough asphalt or concrete, only one will spin.
Next time you do "spin both wheels" go back to the area, and check out the marks closely; You'll see the marks aren't really the same. One tire did in fact have more traction, and it was the other that spun.



