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I love this stuff. I've been using 5W-30 in all my vehicles. Not sure I fully understand the plastic molecules tangling and untangling will have to read that a couple times for it to sink in
I've only used 5w-20 for my 2015 6.2 because that is what is specified but then Ford changed the spec to 5w-30 shortly after.
as far as I know we have never gotten an official explanation why. Most folks use the 5w-30. It probably wouldn't affect me as I live in tropical southeast Texas.