[retengw31]

This is precisely the same info I have gleaned as not only do I run Rotella T in all my three Olds W cars, I also have an old Ford PSD with 200k miles and hoping for 500k. It's had a steady diet of Rotella T CI-4 forever. Rule of thumb is if you see anything on there about CJ-4, it's the new lower zinc formulation.

The only way to get that now is in the Synthetic Rotella T which still seems to be in the CI-4 category everywhere around here. That stuff is expensive when you consider 14 quarts every 3000 miles. The small extra cost per year in the muscle cars is no biggee.

Oh yeah, the Citgo diesel oil here at Murrays is still CI-4. I'll park everything before I use anything Citgo. And yup, that's a political statement.

I think a good formulated oil at $4.00 a quart would be great. That's bout what I was paying for the old Rotella T CI-4 and CI-4 Plus.