Grade is irrelevant. Approval is.It does list MB 229.51 but I want to stay with 0-40 rather than 0-30. Thanks for feedback. Learned a lot with this thread.
MB229.51/52 is minimum 3.5 HTHS. That is what matters.
To give you example:
Motul 5W30 X-Clean+ has HTHS 3.6.
Mobil1 ESP 0W40 has HTHS of 3.53.
Actually Motul is going to provide better protection at the limits regardless that KV100 is lower.