viscosity comparison test of engine oils

Oils may have more than one performance level.įor automotive gasoline engines, the latest ILSAC standard includes the performance properties of each earlier category and can be used to service older engines where earlier category oils were recommended. Vehicle owners should refer to their owner’s manuals before consulting these charts.

The current and previous ILSAC standards are listed here. ILSAC Standard For Passenger Car Engine Oils Refer to engine manufacturer recommendations to determine if API FA-4 oils are suitable for use. API FA-4 oils are not interchangeable or backward compatible with API CK-4, CJ-4, CI-4 PLUS, CI-4, and CH-4 oils. For diesel engines, the latest category usually - but not always - includes the performance properties of an earlier category.ĪPI FA-4 and the FA-4 Donut identify certain XW-30 oils specifically formulated for use in select high-speed four-stroke cycle diesel engines designed to meet 2017 model year on-highway greenhouse gas (GHG) emission standards. If an automotive owner's manual calls for an API SN oil, an API SP oil will provide full protection. For automotive gasoline engines, the latest engine oil service category includes the performance properties of each earlier category. Oils may have more than one performance level. Vehicle owners should refer to their owner's manuals before consulting these charts. The current and previous API Service Categories are summarized in convenient charts.

Viscosity comparison test of engine oils