Originally Posted By: zeng
Originally Posted By: Garak
Thanks for the link. I had never checked whether they kept that one dual rated. So, yes, this 10w-30 would have reduced phosphorus,
while a 40 grade wouldn't have to. But, what they do in actuality with the 40 grades would be up to the formulators.
Unlike CJ4 era, CK4 xW40 not complying with maximum P limit of 800 ppm among others, would not qualify for an SN/SM rating.
This Delvac CK4 15W40's claims of SN rating would have implied compliance of P max limit of 800 ppm, JMHO.
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That's why I was confused, Mobil is saying in their Product Guide that the TDT 5W-40 is now CK-4 AND SN. So, it is now updated for both specs. Yet, Mobil is saying it has 1300 of zinc, and 1100 phos.
It states SN, and has higher zinc levels, so, I was wondering how they did that.