Rotella t-4 zinc and Phosphorous levels?

Thanks, I had used up my old stock of t-4. The truck (99 7.3 manual 6 sp) had t-4 in it since new going on 255k miles on it now.

I've been using T5 since it was introduced with no adverse effects in my older (97 and 2002 diesels). I do use a nano borate additive in my oil and a fuel additive in the diesel however.

Yes...