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Mobil 1 5w20, Motorcraft filter. That's what I run. I go shorter intervals than recommended, so I'm not too worried about anything beyond stock filtration. I've always had good look with Mobil 1.

Honestly, just about any 5w20 semi-synthetic or full synthetic will work fine. There are good and bad filters, but the worst filter is better than not changing your oil at all.
5w 30. No reason to use 5w 20.
 

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I use Motorcraft full synthetic and Motorcraft filter. I drive less than 6,000 miles a year so i change it every 6 months, comes to an average of 2,600 to 2,900 miles.
That's a damn shame to waste all that good oil that you throw out after 2,900 miles. That's crazy bro, lol. Not only do you throw it out after 3k (which by the way went out with pagers and pay phones) but you spend the extra loot for a full synthetic blend and still throw it out after 3k. Wow! Good stuff, Bananas
 

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The manufacturers recommended oil change interval with the 11 plus mustangs is 10k miles and that's just with regular oil. So if your spending all this money on fully synthetic oil such as example Royal Purple, then no reason in the world why you can't go 10k intervals for oil change. Your not racing your car.
 

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It's not hurting anything to change early, plus he's not wasting more than $50 for an entire year. I don't trust 10k intervals. The oils viscosity may last that long but dirt and grime are still present.
Well, I agree 10k does sound a bit long but I don't think the Ford Corporation would lie about the oil change interval. 3k. Omg, that's crazy. Certainly, its not hurting anything to change the oil but a waste of money and perfectly great oil life left but if someone wants to due that, have at it. The 3k rule is so outdated and did that back in 1992. Its called evolution! For me, the oil gets changed at the same time the tires get rotated and that's every 7500k miles. Regular oil mind you. Now with my mods and will be driving the car a bit more aggressive, I will most likely use a fully synthetic oil, however the 7500k interval will remain the same.

The best advice I can give is due what ever one feels comfortable with oil changes at 3, 5, 7, 10k mile intervals.
 
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