2005 Ford Thunderbird Owner Guide 2nd Printing - Page 188
2005 Ford Thunderbird Manual
Page 188 highlights
Maintenance and Specifications 2. If the engine oil level is not within the normal range, add only certified engine oil of the recommended viscosity. Remove the engine oil filler cap and use a funnel to pour the engine oil into the opening. 3. Recheck the engine oil level. Make sure the oil level is not above the MAX mark on the engine oil level indicator (dipstick). 4. Install the indicator and ensure it is fully seated. 5. Fully install the engine oil filler cap by turning the filler cap clockwise tightly until clicks are heard, or until it is snug. To avoid possible oil loss, DO NOT operate the vehicle with the engine oil level indicator and/or the engine oil filler cap removed. Engine oil and filter recommendations Look for this certification trademark. Use SAE 5W-20 engine oil. Only use oils "Certified For Gasoline Engines" by the American Petroleum Institute (API). An oil with this trademark symbol conforms to the current engine and emission system protection standards and fuel economy requirements of the International Lubricant Standardization and Approval Committee (ILSAC), comprised of U.S. and Japanese automobile manufacturers. To protect your engine's warranty use Motorcraft SAE 5W-20 or an equivalent 5W-20 oil meeting Ford specification WSS-M2C930-A. SAE 5W-20 oil provides optimum fuel economy and durability performance meeting all requirements for your vehicle's engine. Do not use supplemental engine oil additives, cleaners or other engine treatments. They are unnecessary and could lead to engine damage that is not covered by Ford warranty. Change your engine oil according to the appropriate schedule listed in the scheduled maintenance information. 188 2005 Thunderbird (tbr) Owners Guide (post-2002-fmt) USA (fus)