OMG, what did you expect from Castrol to tell you? Use in BMW non-approved oil?I emailed Castrol directly, and this is their response:
"According to Castrol’s lubrication guide recommended for the 2007 BMW 750Li 4.8L 8-cyl with the N62 engine is the following:
5W-30 or 5W-40 engine oil meeting BMW LongLife LL-01.
Castrol EDGE 0W-40 oil does not align to the oil grade recommended by BMW for this engine and would not be recommended for use in said vehicle. In this case, Castrol EDGE 5W-30 A3/B4 or Castrol EDGE 5W-40 would be the right choice.
While a certain grade of oil may be suitable for one vehicle, it does not mean it is best for your vehicle. The GRADE of oil depends on the vehicles engine design, and the GRADE recommended by the vehicle manufacturer is the BEST for your specific vehicle.
Oil flow is critical to proper engine protection. When your engine starts, the engine oil circulating throughout the engine must be pumped to reach critical engine parts. Using a grade that is too heavy can hamper the lubrication. Conversely, using a grade that is to light for your vehicle can hamper the high shear protection needed for your engine and can cause vehicle damage."
Castrol 0W40 did not change in formulation when it had LL01 before update. That pre-2018 LL01 was suitable for N62 engine. What happened is that BMW changed specification with new engines in mind. Is new LL01 suitable for older engines? Of course. But, you are not limited in older engines to oils with new LL01 specifications.
Motul on other hand is recommending for N62 engine 0W40 oil!