That’s what we used to put in our Delta 88… either that or 10W-40 maybe that “in winter”…. (Better than 5W in API SJ? LOL!)
Because of the SJ it is newer than 1992, about to Google and cheat… I’ll say mid to late 90s based SOLELY on the API SJ and that our year 1992 vehicles (Olds, again, 10 years newer had a 3800 Series 1) were API SG I think .
Wow SPI SH was around for a short time. (So was SL and the first motor oil I bought was SL when SJ was being phased out. SL was the “new” oil and I was asking if it was “better.”)
Then you get those that seek out API SJ oil because that is what it says on the cap…