It does seem strange they wouldn't provide HTHS number. They will make sure they put in flash point, which hardly seems worth mentioning, but HTHS is one of the critical components that Detroit in its Lubrication Manual outlines as essential to choosing a proper oil. Sure, the product mentions it meets 93K218 Detroit specs, but without HTHS, there is no way to know for certain? With the now two specs out regarding HDEO, and those two specs having differing HTHS requirements, having those numbers available is more critical than ever to the end user.