M1 P/Zn levels - 0W-20 vs. 5W-20

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I was browsing the ExxonMobil website and came across their guide for Phosphorus and Zinc levels in the Mobil 1 family of oils. It came to my attention that their GM Dexos 1 Gen 2 licensed 0W-20 oils all contain a reduced level of Phosphorus and Zinc compared to their 5W-20 oils, or even the HM versions of 0W-20. Does anyone have any idea why?


P- 650 ppm, Zn-750 ppm

1) M1 AFE 0W-20
2) M1 EP 0W-20
3) M1 T&SUV 0W-20

P- 800 ppm, ZN- 900 ppm

1) M1 HM 0W-20
2) M1 EP HM 0W-20

3) M1 EP 5W-20
4) M1 EP HM 5W-20
5) M1 5W-20
6) M1 HM 5W-20
7) M1 T&SUV 5W-20
 

OVERKILL

$100 Site Donor 2021
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Maybe they are using an organic AW chemistry that reduces the requirements? I recall that being the reason why the AFE 0w-20/0w-30 oils had lower levels.
 
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