Overdrive is the normally allowed position
It won't shift into overdrive until the speed is higher anyway ( such as on the
highway / freeway )
If you are towing something , or are driving in hilly country where the
transmission is constantly shifting between overdrive and drive , you want to
switch the overdrive off using the switch on the end of your gear selector
lever ( P R N etcetera , the O/D OFF light will appear in your dash )
In a 1997 Mercury Mountaineer : r134a
Since the first model year of the Mercury Mountaineer is the 1997 model it would be ( r134a )
On a 1997 to 2001 Mercury Mountaineer : Check the Vehicle Emissions Control Information ( VECI ) decal located in the front of your engine compartment . It shows what type of spark plug to use and the spark plug gap
Mercon V
Use a hammer
" regular " unleaded - 87 octane
DOT ( 3 ) brake fluid , if that is what you are asking ?
You can view the 2000 Mercury Mountaineer owners manual online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides ( pages 238 and 239 will answer your question )
According to the 2002 Mercury Mountaineer Owner Guide : For the 4.0 liter SOHC , V6 engine ( 5W-30 ) For the 4.6 liter V8 engine ( 5W-20 )
According to the 2005 Mercury Mountaineer Owner Guide : The 4.0 liter V6 engine takes ( 5W-30 ) The 4.6 liter V8 engine takes ( 5W-20 )
According to the 2002 Mercury Mountaineer Owner Guide : The 4.6 liter V8 engine takes ( 5W-20 ) The 4.0 liter SOHC , V6 engine takes ( 5W-30 )
SAE 5 W 30 - certified for gasoline engines