SAE J300

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SAE J300 is a standard that defines the viscometric properties of mono- and multigrade engine oils, maintained by SAE International.[1] Key parameters for engine oil viscometrics are the oil's kinematic viscosity, its high temperature-high shear viscosity measured by the tapered bearing simulator, and low temperature properties measured by the cold-cranking simulator and mini-rotary viscometer. This standard is commonly used throughout the world, and standards organizations that do so include API and ILSAC,[2] and ACEA.[3]

Viscosity grades[edit]

SAE viscosity grades include 0W through 25W in increments of 5W, and 4 through 16 in increments of 4, and 20 through 60 in increments of 10. The former grades denote a multigrade engine oil's low-temperature properties (W denoting "winter"), whereas the latter grades denote an engine oil's properties at the operating temperature of an engine. To illustrate, a lawnmower may require SAE 30 monograde engine oil that must meet the SAE 30 requirements. In comparison, a contemporary passenger car engine may require SAE 0W-20 multigrade engine oil that must meet both the SAE 0W and SAE 20 requirements.

The addition of the SAE 8 through SAE 16 viscosity grades permit improved fuel economy through reduced hydrodynamic friction.[4][5]

See also[edit]

  • SAE J306 – defines the viscometrics of gear oils


  1. ^ "J300 Engine Oil Viscosity Classification". SAE International. 2015.
  2. ^ "Motor oil matters - Which oil is right for you?" (PDF). American Petroleum Institute. 2013. Retrieved 2018-03-18.
  3. ^ "ACEA European Oil Sequences" (PDF). ACEA. 2016.
  4. ^ Patrick Ponticel (2013-04-01). "SAE codifies new oil viscosity grade (SAE 16)" (Press release). SAE International.
  5. ^ Steve Swedberg (2017-04-18). "JAMA Proposes SAE 0W-8 Spec". Lubes 'n' Greases. 5 (11).

Further reading[edit]