AMSOIL 5w40 vs Motorcraft 5w40 a comparison

[oXObsidianXo]

Just had some analysis come back for my 2021 Ford F350 for AMSOIL Signature Series that I recently switched to and the motorcraft that was in it before the change. Both done right around 7800kms during slightly different times of year, the AMSOIL was subjected to some much colder weather. Motorcraft filters used for both oil changes as well. I’m of the opinion the AMSOIL seems to be a bit better on the additive side, but would be curious to hear opinions.

 

[CleverUserName]

Those reports don’t look right. They both should have at least 1000 ppm of phosphorus.

 

[oXObsidianXo]

Those reports don’t look right. They both should have at least 1000 ppm of phosphorus.

I have another older one with motorcraft 10w30 semi synthetic with 879ppm phosphorus. So it does seem to be standard for this truck, universal averages is 1003ppm phosphorus too according to Blackstone.