2003 Mercury Mountaineer Oil Capacity, Types, & Filters

Your essential guide to 2003 Mercury Mountaineer oil change is here! No more searching – find all the critical oil specs for your 2003 Mercury Mountaineer, including oil capacity, recommended oil viscosity (type), and the correct oil filter.

We cover all engine options, categorized by their specific engine codes, ensuring you get the right information for your specific configuration. Keep reading to discover everything you need for your next 2003 Mercury Mountaineer oil change!

Scroll Table ➜

Engine & Code	Oil Capacity	Oil Viscosity/Type	Oil Filter
4.0L 6-cylinder [K] K Flex	5 quarts (with filter)	SAE 5W-30 (All TEMPS)	Ford FL-820-S
4.6L 8-cylinder [W] W	6 quarts (with filter)	SAE 5W-20 (All TEMPS)	Ford FL-820-S

Select Your 2003 Mercury Mountaineer Engine Option

4.0L 6-cylinder Engine Code [K] K Flex

Engine:

4.0L 6-cylinder [K] K Flex [aka 4.0L V6 (Flex)]

Body & Trims:

Base

Oil Capacity:

5 quarts (with filter)

Oil Viscosity/Type:

SAE 5W-30 (All TEMPS)

OEM Oil Filter:

Ford FL-820-S

Oil Filter Replaces:

F1AZ-6731-A

2003 Mercury Mountaineer 4.0L 6-cylinder [K] K Flex oil change details

Oil Grade:

SEO60

Oil Capacity:

5 quarts. (with filter). This is the capacity with the oil filter installed. Always check the oil level after refilling.

Oil Viscosity/Type:

SAE 5W-30 (All TEMPS)

Name of Oil Filter:

N/A

Wix Oil Filter:

51372-EA

Wix Air Filter:

42484-EA

Coolant Capacity:

16 quarts - For models WithOut an auxiliary Heating, Ventilation, and Air Conditioning (AUX HVAC) system.
18 quarts - For models with an auxiliary Heating, Ventilation, and Air Conditioning (AUX HVAC) system.

Oil Drain Plug Torque:

19 ft/lbs (Oil Drain Plug)

Notes:

If you are using E85 or M85 fuels, use AMSOIL of the appropriate viscosity and follow the Original Equipment Manufacturer (OEM) recommended drain interval. Extended oil drain intervals are only possible if you perform an oil analysis when using these types of fuels.