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So my 2.0 MTX Cougar has about 235k on it. I normally use 5w-20 syn and my question is.. Since I live in FL and my mileage is getting up there, should I start using 5w-30 instead? I know it will be fine if I continue changing the oil early, like i do. But it is always hot and I drive hard (bc im slo), so I'm curious if the thicker oil would be better for bearing life, given my circumstance.
 

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The original spec for our engines was 5W-30, ford changed the spec to 5w-20 to save a few tenths of a mile per gallon across their whole fleet for an EPA credit, this was sometime around like 2008.

I tried using 5w-20, and noticed it burnt oil like crazy, switching to 5w-30 basically eliminated oil burn. I was always using full synthetic for both too.

Given you're in the tropics I'd say it's probably a decent idea to use a 5w-30.
 

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The right answer is do what your manual says.
Both the Zetec and the Duratec are pretty incredible designs. They will tolerate pretty much any standard oil viscosities. For a hot climate though, I would be going heavier. Probably 10/30
 
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