How to Choose the Oil and Fluids for a Mercury Cougarby Kyle McBride
The owner's manual for the 2002 Mercury Cougar called for SAE 5W-20 premium-grade synthetic blend engine oil, a change over the previously recommended SAE 5W-30. Starting in January of 2002, however, Ford announced that all Mercury Cougars from 1993 through 2002 should use SAE 5W-20 engine oil with no substitutions for extreme cold climates. Pick a premium-grade synthetic blend with the API-certification stamp on the bottle.
Transmission, Transaxle and Power Steering
If your Cougar has a manual transmission, use a full-synthetic manual transmission fluid. For the automatic transmission, transaxle and powering steering, use Mercon-V ATF fluid. The owner's manual called for Mercon fluid and warned against substituting or mixing with Mercon-V, however, in service bulletins released in 2006 and 2007 -- TSB 06-14-4 and TSB 07-1-7, respectively -- Ford announced that all applications calling for Mercon fluid should use Mercon-V fluid.
Replace the coolant in your Cougar with the same color coolant it came with. Motorcraft makes green, yellow and orange coolants. Your 2002 Cougar takes Motorcraft Specialty Orange [Engine Coolant](https://itstillruns.com/what-is-engine-coolant-13579658.html) VC-2 or another extended-life coolant that meets specification WSS-M97B44-P. Don't mix coolant colors. The hydraulic brake system takes DOT3 fluid, but you can use DOT4 fluid in a pinch.