2000 Ford Focus Owner's Manual - Page 188
2000 Ford Focus Manual
Page 188 highlights
Maintenance and care Engine oil and filter recommendations Look for this certification mark. Ford oil specification is WSS M2C153 G. Use SAE 5W 30 motor oil certified for gasoline engines by the American Petroleum Institute. 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 oil 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, 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. 188