Originally Posted by Ford guy #6
Then why would the European ford maufacturs highly not recommend 5w-20? The guy on here that stated that fact suggested that it is due to some governmental resticton on oil to the car manufacturing company's have to follow here in the states and why moc me and act like my question is meaning less? All I wanted was an opinion as to the fact of is there something better that we could be using in our trucks?
I'm not mocking you and provided my opinion. The real answer to your question would require a high level of technical knowledge in regards to our engines and testing of different weight oil. The odds of someone being able to produce specific comparisons with proof (which is what you're asking for) is very very low. Lottery has better odds.
What you'll get here:
Billy bob down the road running 25w-70 in his truck can vouch that the oil is the reason his truck lasted to 200k miles.
He does not know and cannot prove that with recommended 5w-20 it might have went 50k miles or 300k miles.