2003 Mazda B2300 Owner's Manual - Page 201

Maintenance and Specifications 4.0L Engine Look for this certification trademark. SAE 5W-30 engine oil is recommended. Only use oils "Certified For Gasoline Engines" by the American Petroleum Institute (API). Use an equivalent Mazda Specification. 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 according to the appropriate schedule listed in the service maintenance section. Engine Oil Filter Recommendation Change your engine oil filter according to the appropriate schedule listed in the service maintenance section. Mazda production and aftermarket (Mazda) oil filters are designed for added engine protection and long life. If a replacement oil filter is used that does not meet Mazda Material and design specifications, start-up engine noises or knock may be experienced. It is recommended you use the appropriate Mazda oil filter (or another brand meeting Mazda specifications) for your engine. 201