Summit Racing oil

33IMP said
Well, I'm 250 miles away at the moment, but if I can find this thread in a week or two, I'll post what you asked for. I do know off the top of my head that it is rated SD.

If you remember, I'd appreciate it. It would help satisfy my curiosity. I'd be able to know that the updated spec would have been after a specific date.
The date code would probably resemble this format. It could be on the bottle or the box. They were charged later, but the SD rated stuff was before that.