Originally Posted By: Garak
Originally Posted By: Nissan101
Its a 5w40 oil.
In reference to what slacktide_bitog mentioned, it seems unlikely it would be A5/B5. It may technically be possible, but it's a fine line. A5/B5 can have an HTHS of 3.5 or lower. A 10w-40 must have an HTHS of 3.5 or higher. So, there's a fine line to walk there. It cannot be below 3.5 and remain a 10w-40 by SAE J300, and cannot go above 3.5 and be A5/B5.
Exactly, which makes me nervous. How does it pass the stay-in-grade shear stability test without using up some KV100 and HTHS headroom that it never had to begin with ?
I don't trust a A5/B5 5W40, it can only exist on the borders of reality, who would formulate to a line when most formulate to be clearly in a well defined area for a grade.