Most Fords since about 2002 or so use 5W 20 engine oil. I would stick with the 5W but maybe go up to 5W30 now that it has that many miles on it. I would also switch to 3000 mile oil changes (or less). The 2009 3.0 has variable timing and uses oil pressure to activate it - I would definitely not switch to 10W40 or 15W40 in a variable valve timing vehicle.
It if truly has low oil pressure you are going to want to correct that issue as the oil pressure is used for the cam phazers and the chain tensioners. A loose timing chain flopping around inside the timing chain cover can get real serious real fast.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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