2001 Mercury Cougar Owner Guide 2nd Printing - Page 209

Maintenance and care Engine oil and filter recommendations Look for this certification trademark. SAE 5W-20 engine oil is recommended Use oils Certified For Gasoline Engines" by the American Petroleum Institute (API). Use Motorcraft or an equivalent oil meeting Ford specification WSSĆM2C153ĆH. SAE 5WĆ20 oil provides optimum fuel economy and durability performance meeting all requirements for your vehicle's engine. Do not use supplemental engine oil additives, oil treatments or engine treatments. They are unnecessary and could, under certain conditions, lead to engine damage which is not covered by your warranty. Change your engine oil and filter according to the appropriate schedule listed in the Scheduled maintenance guide". Ford production and aftermarket (Motorcraft) oil filters are designed for added engine protection and long life. If a replacement oil filter is used that does not meet Ford material and design specifications, startĆup engine noises or knock may be experienced.