I need to drain some oil out of my 2005 mercury mountaineer. Where is the drain located and how should I do that?

Fuses?

Fuse box location and diagrams: Mercury Mountaineer (2002 ...

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Mercury Mountaineer (2002-2005) fuses and relays

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The fuse box is located under the instrument panel on the driver's side. The location of the fuses in the passenger compartment: Mercury Mountaineer (2002-2005 ...

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Coolant Flush How-to: Mercury Mountaineer (2002-2010)

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How to flush the coolant antifreeze in a 2006 Mercury Mountaineer Convenience 4.0L V6 How-to video for petcock, radiator flush and burping on a 2006 Mercury ...
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On the motor inline with the cam.

Mercury Mountaineer 2002 2005 Factory Service SHop repair manual Download

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It depends on how many miles you drive annually, the environment your vehicle is driven in (dusty, hot, cold, humid, dry, etc), the type of oil you use (conventional, synthetic blend, or full synthetic), and the condition of your car's engine. You should consult your owner's manual and the data on your engine oil.

I drive a 1999 Mercury Mountaineer 5,0L and drive it about 1,500 miles annually. I use a synthetic blend oil and change my oil and oil filter twice a year. I change the oil in the spring so I have fresh oil for the hot summer driving season and I change my truck's oil in the fall after the hot summer driving season. Because my Mountaineer has a lot of miles on it, I use thinner oil in the winter 5/20 and thicker oil in the summer 10/20. I check my oil regularly and look at the color and feel the oil for grit. This has worked for me for many years and I have had good performance from my vehicles.

You can go on the different oil manufacture's websites and read their recommendations as well. There has been much debate about when to change the oil in a vehicle so you have to decide for yourself what schedule you want to follow.

Use a bottle of yellow HEET dry gas to remove any moisture problem in the fuel.

Use starting fluid to aid starting.

Check youtube someone may have already made a video on how to re set it.

Ford Explorer, Mercury Mountaineer, 2002-06

To reset CHANGE OIL SOON/OIL CHANGE REQUIRED message on the Message Center, press the SET UP control to access the System Check mode. Press and release the RESET button to display “OIL LIFE % HOLD RESET NEW” is displayed. Press and hold the RESET button for 2 seconds until “IF NEW OIL HOLD RESET” is displayed. Press and hold RESET button until “OIL LIFE SET TO 100%” is displayed.

Ford Five Hundred, Freestyle, Mercury Montego 2005-06 Tap the ODO/TRIP button to toggle the display between the odometer and trip odometer. Tap on the ODOiTRIP button again to toggle the display between the trip odometer and OIL LIFE % display. Press and hold the ODO/IRIP button for 2 seconds or more to display OIL LIFE 100%. Your oil life in now reset.

Before you do this you might want to try fresh gear lube. On Ford products they use a synthetic additive in the rear and not in the front 4x4 axle.
The next thing would be to determine if it is a wheel bearing or a pinion bearing. You have to pull the axles and eliminate them as the problem. You might get lucky and not need to do the pinion.
The technical part of shimming the pinion gears with replacing the pinion bearing is about the worst part of the job. You won't know about the gears until you see them. You will need extra shims on hand.
It is a moderate job for two people. If you have all the parts it can be done in a day.