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Old 01-18-2010
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oil viscosity

so there i was in the automotive section at the local walmart so many types of oil but im looking for synthetic blend motorcraft 5w-30 the only oil theyre out of so i go for the 5w-20 but it being hot as hell in florida im rethinking my decision im about to change the oil but dont feel like driving a half hour to check another wally world whats the difference when it comes to the viscosity there ive heard 5w-20 is for cold weather which i certainly dont need
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Old 01-18-2010
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Ford went to 5w 20 to help meet cafe standards cause it will get you slightly better gas mileage over 30. I've got 90,000 on my 4.0 and have used it in Texas from the get go when I bought it new. The same with my 3.0's
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Old 01-18-2010
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sweet to change my oil i go
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Old 01-18-2010
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Have you ran the synthetic blend before?
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Old 01-18-2010
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no this is the first oil change ive had it but it was owned from new by a 72 yr old man im guessing he had it done at the dealer which i believe uses motorcraft synthetic blend
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Old 01-18-2010
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I thought ford kept the 4.0 motor using 5w30 because 5w20 was too thin for the oil pump used in the 4.0?

I was reading around when trying to figure out if I should run my 3.0 on 5w20 as the newer engines run...but I'm staying at 5w30. It works and works well (as far as I can tell).

Edit: just read that Granite has an '04 4.0....probably should listen to him...
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