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.
SOURCE: Change the oil on a 2005 Mercury Montego
Go to a automotive store and tell them you have a 2005 Mercury Montego and what engine it has if there is more then one model and get an oil filter and the oil. Put the car up on ramps and secure it making sure it won't roll back or fall while you are under it. get under the engine and look for the oil pan which should have a bolt in the bottom of it where you can drain the oil. Drain the oil in a proper container and then put the drain plug back in the pan. Then find the oil filter and unscrew it and remove it.. It could be full of oil so watch out and make sure the pan is underneath the filter. Wipe the base where the oil filter screws on and make sure the gasket from the old filter is not still on the engine. Get your new filter and take your finger and put it in one of your new containers of new oil and spread that on the gasket of the new filter. Screw on the filter until the gasket touches the base and then turn only a little more then a 1/4 to 1/2 turn tops. Do not over tighten the filter. Find out what oil the vehicle needs (probably 5-30) and look for the oil cap on a valve cover under the hood. It probably takes 5 quarts but check for sure in your manual or ask when you are at the automotive store. Put the oil in and put the filler cap back on. Now go start the vehicle and make sure you have oil pressure by either the oil pressure guage showing pressure or the oil pressure idiot light goes off and while running check under the car for any signs of leaks. If no leaks then back the car off the ramps and shut the car off on a level surface. Let it sit 10 minutes and check for leaks underneath the car and check the oil dipstick to make sure the proper level of oil is in the engine. Then you are set.
Always check your air filter when changing oil to make sure it is clean as that helps your engine run better and you save gas in the process. Good luck
It is also best to change oil when your engine is warmed up as well.
SOURCE: 2005 Mercury Mountaineer rear end whine, how hard to fix
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.
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SOURCE: I want 2 change 2004 mercury mountaineer transmission fluid
The best way to change it is to flush it out You can do it yourself, but I do not recommend. A shop that is good like a Monro or Firestone usually charges about 100 bucks to flush and that includes the fluid. If you do it yourself, you will save about 60 dollars, but you risk damage to your radiator.
you will need a hose and an adapter. you back out the lower, or upper cooler line for your trans, whichever is the easiest to get to, (Some trucks have an auxiliary engine oil cooler, but make sure you are flushing the trans lines) put the adapter into the rad where you removed the line, and put a hose from each one down into a bucket. Have about 14 qt's of ford trans fluid ready. Put the funnel into the trans dip stick, and start the engine. pour the qts into the dipstick tube while the old fluid is pumped into the bucket. When you have about two gallons pumped into the bucket shut the engine off and reattach the line into the radiator. start up the engine and check your level. Fill with additional fluid if needed.
note: some say you should drop the pan. two things, you only change half the fluid when you do it that way, and second if you need to change the filter because it is clogged, it is too late for the transmission. The filter is only there to protect the valve body, not keep the fluid clean.
Hope this helps
SOURCE: where is 2005 mercury mountaineer fuel filter
Fuel filters can usually be found on the drivers side under carriage about middle of the vehicle. There should be a canister type filter with 2 metal lines connected to it. One on both sides of the canister. you will need to disconnect both lines and the bracket that holds the filter in place and install the new filter. I do suggest that you remove the fuel cap to try and relieve some of the fuel pressure built up in the lines before disconnecting the filter so you won't be sprayed too much with fuel. If you have any other questions please do not hestitate to ask.
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SOURCE: How do you reset the change oil message on a 2007
Ford Explorer,
Mercury Mountaineer, 2002-07
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.
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