1998 Ford Crown Victoria Owner's Manual - Page 114
1998 Ford Crown Victoria Manual
Page 114 highlights
Maintenance and care 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 "Service 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, startup engine noises or knock may be experienced. It is recommended you use the appropriate Motorcraft oil filter (or another brand meeting Ford specifications) for your engine application. Changing the engine oil and filter Change your engine oil and filter according to the appropriate schedule listed in the "Service 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, startup engine noises or knock may be experienced. It is recommended you use the appropriate Motorcraft oil filter (or another brand meeting Ford specifications) for your engine application. BRAKE FLUID Checking and adding brake fluid Brake fluid should be checked and refilled as needed at least once each year: 1. Clean the reservoir cap before removal to prevent dirt or water from entering the reservoir. 114