MB229.5 is max 10%.Seems like most of the A3/B4 oils carrying MB229.5 in 0W30/0W40, and 5W30/5W40, I really view them as being the same grade it's like they're formulated targeting and a certain HTHS with volatility below 10% which results in a final product that has a KV100 right on the edge of 30 or 40 grade.