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Message: <blockquote data-quote="NERD" data-source="post: 538415" data-attributes="member: 8956">if you read the article, then seen that it's not the 20 or 30 that's the problem, it's the 5w or the 10w. I don't know what year it was but Ford switched to 20 to save a fraction of MPG. So, since there was not a major overhaul to the Modular engine design (heads don't count) ford believes this is satisfactory. Now to clear it up a little, 90% of engine damage is done during initial start up when the there is no oil at the top. When your car sits over night and the temp drop it thickens the oil and the "think" oil takes longer to surface the engine. "There is no oil weight that satisfactorily coats the engine on initial start up." So the best choice is to use 5w over 10w or even a 0w for normal duty cars. If my engine wasn't such a high performance engine, I'd be running 0w20 but I often see temps above 214*. I suggest reading post #7 and take in what it means.I'm not strong arming anyone to think the way I do but knowing as much as you can about things that involve you,"I think" is of great importance.Also, Ford and all other Car makers suggest tolerances, fluids and maintenance based on the worst case scenario owner/driver. They do this for longevity and lower maintenance.</blockquote>