Originally Posted By: SilverC6
Originally Posted By: MNgopher
Originally Posted By: wsar10
I think we are all going to find out in years to come that the 5-20's are gonna fall short allot in terms of durability...
Its been over 10 years since 5w20 was put into mainstream use. How much longer are we going to have to wait and how many hundreds of thousands of miles will be enough?
In the meantime, this isn't an application for 5w20. 5w30 would be my preferred flavor, as specified by Ford.
I don't see any compelling reason to move to a back spec'ed engine oil driven by governmental regulations for improved fleet fuel mileage.
You're just repeating the same, tired old lies and cliches. That's simply not the case...
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Engineers, free of political agendas, selected a 5W-30 for serviceablility in this engine.
No. They "selected" it because the oil pumps in these particular engines are better off with a bit more pressure and a (slightly) thicker grade of oil. But then, at one time people said the same thing about 5W-30 and numerous manuals even stated not to use 5W-30 in "sustained highway driving" in like the 1980's. But technology of blending has made those silly notions obsolete. And the truth is that your 5W-30 eventually becomes a 5W-20 anyways.
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I'd stick with their original recommendations.
The "original" recommendations are the same, the engine was never backspec'd to 5W-20, so you're just making an issue where none exists.
That being said, I'm not necessarily a fan of going back to a thinner weight in an older, higher mileage engine if a car is leaking or using oil. I would even use 10W-30/40 in this engine in hotter months or if I towed with it...