The C- Series contains API CK-4 (most Recent), CJ-4, CI-4 PLUS, CI-4, and CH-4 oils. The “C” stands for compression ignition systems, which is how diesel engines operate. The API C-series classifications pertain to diesel engines. Use in more modern engines may cause unsatisfactory performance or equipment harm. Use in more modern engines may cause unsatisfactory performance or equipment harm.ĬAUTION - Not suitable for use in gasoline-powered automobile engines built after 1930. Use in more modern engines may cause unsatisfactory performance or equipment harm.ĬAUTION - Not suitable for use in gasoline-powered automobile engines built after 1951. Use in more modern engines may cause unsatisfactory performance or equipment harm.ĬAUTION - Not suitable for use in gasoline-powered automobile engines built after 1967. May not provide adequate protection against build-up of engine sludge.ĬAUTION - Not suitable for use in gasoline-powered automobile engines built after 1979.ĬAUTION - Not suitable for use in gasoline-powered automobile engines built after 1971. May not provide adequate protection against build-up of engine sludge, oxidation, or wear.ĬAUTION - Not suitable for use in most gasoline-powered automotive engines built after 1988. May not provide adequate protection against build-up of engine sludge, oxidation, or wear.ĬAUTION - Not suitable for use in most gasoline-powered automotive engines built after 1993. API SN with Resource Conserving matches ILSAC GF-5 by combining API SN performance with improved fuel economy, turbocharger protection, emission control system compatibility, and protection of engines operating on ethanol-containing fuels up to E85.ĬAUTION - Not suitable for use in most gasoline-powered automotive engines built after 1996. Introduced in October 2010, designed to provide improved high temperature deposit protection for pistons, more stringent sludge control, and seal compatibility. API SP with Resource Conserving matches ILSAC GF-6A by combining API SP performance with improved fuel economy, emission control system protection and protection of engines operating on ethanol-containing fuels up to E85.įor 2010 and older automotive engines. Introduced in May 2020, designed to provide protection against low-speed pre-ignition (LSPI), timing chain wear protection, improved high temperature deposit protection for pistons and turbochargers, and more stringent sludge and varnish control. Gasoline Engine Oil Service Classifications Here you can see the recommended oil for each ambient temperature: You should be aware of changes in weather and climate to keep your engine fully functional. As an example, a 5-30 is not the same as an SAE 5W-30. If the grade listed is not preceded by “SAE” and/or there is no “W-” between the first and second number, it may not be a multi-grade. This is important since oil naturally thickens when cold and thins when hot. The second set of numbers indicates how the oil flows at higher/operating temperatures. Multi-viscosity motor oils are designated by two numbers – the first set of numbers (0, 5, 10, 15 and 25), is indicative of how the oil flows at low temperatures and is followed by the letter W to designate the engine oil's "winter" grade. The Society of Automotive Engineers (SAE) defines a numerical system for grading motor oils according to viscosity. conventional oils incorporate additives to change its viscosity. Thus, the viscosity index measures the ability of an engine oil to resist becoming thinner at high temperatures. The viscosity changes with temperature to ensure protection and operability under all circumstances. A higher viscosity implies a slower flow and a thicker fluid. Viscosity is simply the resistance of a fluid to flow. The first piece of information speaks to viscosity grade. The label includes two important pieces of information to determine if an engine oil is appropriate for use in your vehicle. The service rating is shown in the API "Service Symbol Donut" on the product label, usually found on the back label. The program certifies that an oil meets certain quality and performance standards. The service rating of passenger car and commercial automotive motor oils is classified by the American Petroleum Institute (API). American Petroleum Institute (API) Service Symbol “Donut”
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