CT sells regular dino oil in Rotella too, but why do you not want synthetic? If it's a cost issue I understand - I offset this by stretching my change interval a little, but IMHO qulaity oil is paramount in this little engine. If you put a boost guage on your truck you'll find that you're always pushing 8-12 psi of boost on the highway. That's a lot of destructive heat seen by the oil, and the expensive turbo, etc.

Just my 2 cents...

1991 HZJ77, 1999 KZJ90, 1999 UZJ100, 1992 M101CDN2
https://www.thegearheadproject.com/category/jdm-journeys/