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Rotella T diesel oil was suggested as an alternative so I contacted them.
I wish I could insert the email msg but apparently that is not possible.
Anyway, in a nutshell, Shell said both Rotella T 15W-40 and Rotella T synthetic 5W-40 have high amounts of zinc and phospherous designed for the HD diesels and should do great in our applications. It is rated gasoline SH which is pre-cat converter standard and diesel CH. Also this oil has an extra high TBN rating in order to keep diesels clean for 25,000 miles. It should have no problem keeping the Olds clean and lubricated.
Oh by the way, I wasn't signed up at ROP. Tried to log on - havan't joined yet. Just had it in my favorites to view. Member now.
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57 Olds 4dr Super 88 
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