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Shine, I totally missed the 750ppm/850ppm line. Not sure how, must be old age or something. Back before '80 all of the major oils had 1200ppm (or more) of combinations of phosphorus & zinc.
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If your Havoline carries an API Rating of SJ, SL, SM or SN (API Link - API Engine Oil Classification ) then it doesn't have 1200PPM of ZDDP and you're not doing anyone any favors by telling them that...

Denny, the question is, "Has not changed since when?" The reformulation of oils was mandated back in the early 80's, and other than oils labeled for specialty use, like Rotella being spec'd for...

Unaltered from what base? Ask them what the PPM of ZDDP is in their Rotella oils today, compared to five years ago.

It's not a matter that the Zinc was removed, but that the amount of Zinc has been reduced. The question is the PPM of Zinc/Phosphorus that's currently remaining after their reformulation.