X5M(S63 Engine) Owners, Keep Your Turbos Alive - Check the Aux Turbo Coolant Pump

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One device you need to maintain your X5M, is this bluetooth voltage analyzer and logger, it connects to the battery and graphs out the cranking voltage! It does what it says, I use it and am more than happy with it. It'll tell you if your battery is getting weak, replace it immediately before your engine stalls at WoT. Clean (and add di-electric grease to) all your batter terminals, cable terminals to your positive and negative connection points of your car to maximize power delivery to your BMW, minimizing any issues.
Bluetooth Car Voltage Analyzer and Logger: https://tidd.ly/2HEpoL7 (Download Torque for free)

I wanted to get the word out there, check your aux coolant pump flow every time you pump gas!! Or more! It will pay off.
The pump costs $230+ new from parts stores, or $100 flat from the dealership. Check yours, as it may be burnt out, and no check engine light will come up. Carly can throw a code if it's broken, but may throw one even if it's brand new, the only way to confirm it's working is to see the flow, or in this case, feel for flowing coolant. If you don't feel anything, you better diagnose it by taking it apart! I've had brand new pumps just jitter instead of spinning and pumping. This cheap part can save you from thousands in repairs. The hot-V of the V8 gets really hot, since it exhausts into the V, normal V8 engines exhaust out the sides. They did this for performance, but now we must suffer a hot-V.
This pump runs off an IC in the pump, the coolant is 105C, that means the integrated circuit, solid state devices, are exposed to very hot temperatures, this can lead to premature failure. The brushless motor is strong for it's size and reliable, but the solid state devices can fail without warning, that's why checking it is so important.
Also, I didn't mention or show this, but take off the cover with the M colors on it, and you'll find rubber coolant hoses connected to all the aluminum pipes with cheap hose clamps, those connections come loose and start spilling coolant, causing a mess! I did this right after I got the car, and it was to remove all those crappy hose connections, and put high quality stainless hose clamps on there. I check them every once in a while for leaks, and can tighten them up if needed. You could also wrap silicone(held in place with a little electrical tape) around the hose, and put the hose clamp on top of that, it will help create a better seal. Metal to natural rubber causes cracks and leaks, so the silicone will help reduce stress on the rubber and prolong it's lifespan.

Hope this helps!
Let me know if you have any questions!
Cheers, David.