I have been using Delo LE-400 15W-40 which is the new formulation (LE = low emission) that has about 1200 ppm ZDDP. You can access the product data sheet (PDS) here. It says that the zinc by mass percent is .13 and the phosphorus is .12. I think that works out conservatively to about 1200 ppm. I have not checked Rotella but my guess is that they too have similar ZDDP with their new oil formula.
Delo 400 LE SAE 15W-40
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