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Hello,
i'm down from the 77-79 forum, but i have been working my way through college with oil changes, for the first 2 years doing them, and the last year just selling them. The reason ford went with 5w20 is because the clearances are tighter on these newer engines. My friend who is a service manager at a ford dealership informed me of that tidbit of info. If you use a heavier weight, such as 5w30 or heavier, ont only will it void the warranty, you take a risk of cooking your new engine! I agree, 10w30 is what i run in my old vheicles, but if I did have a newer ford, I'd make sure to fun the required 5w20. Most major oil brands have it on the market now.
I hope I helped you out.
Lee
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