I just changed the motor oil and replaced the filter in our 2011 Nissan Altima 2.5 S. I took pictures of the process and created a quick guide to help other owners who'd like to do this procedure themselves.
The process is the same for any fourth generation (2007, 2008, 2009,
2010, 2011 & 2012) Nissan Altima equipped with the 2.5 liter I4 QR25DE engine.
Here's the page -
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I hope someone finds it to be useful.Cheers, Paul