Very simple principle, you should remember that, you should not believe any car sales executive blindly. Otherwise, you will be fooled by their pushups for your BMW parts purchasing. If you find that the sales clerk is insisting you to buy a part, which is little cheaper than the market value, then you should ask the sales clerk for the reasons. It is better to remember that, in this world, anything is possible. Therefore, it is better to check the BMW parts whether it is refurbished or spurious. Always try to put your intuition at the first place when you are making your decision about it.