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Will 0W Motor Oil Fix a Noisy Valve Train?
 
Ask Your Stickiest Question. . . Or ask us something you’ve always wanted to know about using our products. We’ll sort through all the submissions and present the best questions to our automotive experts. We'll share the questions and their answers here.
Question:
Will 0W Motor Oil Fix a Noisy Valve Train?
I understand LL-01 are the only factory approved oils for my BMW X5. However it can be a challenge to find. I have 130K on the clock and am not worried about the warranty, only longevity. I have a good deal of unhealthy sounding valve train (?) noise upon cold startup. Would I be correct in using a 0W-XX oil to address? Also, I change my oil every 5K miles. Any problems with using Mobil 1 0W-30 Advanced Fuel Economy even though the HTHS is a bit low?
-- Chris Franks, Bothell, WA
Answer:
We would recommend trying Mobil 1 0W-40 in your BMW.  Mobil 1 0W-40 is BMW LL01 Approved, will provide exceptional flow at cold startup, and provide the appropriate amount of high temperature protection.
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