Originally Posted By: 1JZ_E46
Their answers regarding NOACK were total cop-outs. Let’s be honest. Same for HTHS.
Noack was addressed in this thread, but HTHS is too easy. One can almost always guess the HTHS of a finish motor oil and be correct with 0.1 (or 0.2 on the outside) based upon the specifications it meets. You're not going to be finding, for instance, a 5w30 ILSAC with an HTHS of 3.6. They'll all bump around the 2.9-3.1 mark, with few outliers. Similarly, you won't see a 5w30 in E7 or A3/B4 straying too high above the 3.5 minimum.