Here's the Blackstone reports on the new 10w30 Gen2 Premium Blue One solution (CK4/SP) dual rated and previous 8600ES 10w30 Premium Blue CK4 rated oil. The latest report dated 9/2021 is Gen2. The engine is noticeably quieter with Gen2. We tow a 3 horse trailer in warmer months, and both had an equivalent amount of towing and use over the 5K mile intervals. I'm pleased with the new formulation.