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I have to say - I just finished putting my car on the Mobil 1 0-40 oil and I'm very impressed. Slightly smoother engine and temperatures went down between 5-15 degrees. It also takes quite a while for the oil temperature to level out. It used to be that the temperatures would even out within about 8 minutes of driving. Now it's closer to 12-15 minutes.
Also changed out our 550i to it as well with similar results. I'm impressed.
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