Tony Tony Tony
I was only having a giggle with the above comment, 3kg would be a touch over the top
I've found in the case of the X6 all the weights are to move the weight around in the car, not to increase the running weight in general. The fact the car ends up heavy is just a side effect of it being a bit of a fatty, mine is almost 1700g without any weight in. I have around 100g in mine which I move about to change the balance, I wish I could try it lighter but the base car being so heavy means thats not possible