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Alright, found something credible. source: https://www.jalos.or.jp/onfile/pdf/2009_DEO_Seminar.pdf The DH-1 oil has nearly twice the base number as the DH-2 oil. A little higher lead allowed in DH-1 standard. Soot dispersancy standards are the same. (click the link for all the data. It's at...

I have a 1996 Land Cruiser (HDJ81) with the 24v 1HD-FT engine. I live in Japan, so the oil available is JASO spec. I do have access to some American brands on base, but the selection isn't great. There are two main diesel oils specifications for truck engines: JASO DH-1: A high sulphated ash...