(FAE «The 25th State Research Institute of Himmotology of Ministry of Defense of the Russian Federation», Moscow) E-mail: email@example.com
Актуальная спецификация SAE J300:2015
Keywords: performance, specifications, history, MRV TP-1 method, CCS method, HTHS method, SAE viscosity classes, market place, review, engine oils, engines.
The paper considers the key points of the origin and development of the Engine Oil Viscosity Classification SAE J300 from it beginning in 1911 to the actual edition: brief case history, evolution of the rheological properties owing to the «thickend oils», containing viscosity modifiers and synthetic based oils, MRV (Mini-Rotor Viscometer), CCS (Cold Cranking Simulator) и HTHS viscosity methods, appearance of the new viscosity classes and its value to the runnimg and performance of the passenders cars and heavy-duty truck diesel engines. The fundamentals of actual SAE J300:2015 specification have discussed.
It was emphasized that the key point of the performance specification is the fact of heading for the «thicking» non-Newton engine oils because of its unique performance and very high share in the world consumption significantly exceeding the share of single-season one. The nuances of the specification constrained with SAE 40 viscosity class and HTHS viscosity values have explained as well as role of the HTHS viscosity value providing for the current tendendencies of the automotive development sach as fuel economy and reducing emission.
The detail information regarding use of this performance specification for the development of the current motor oils market place reviewed. Most vehicle manufacturers today specify 5W-20 or 5W-30 for newer vehicles for year-round driving. Some cars specify 0W-20, 0W-30, 0W-40 or 5W-40 for their vehicles.
The right reccommendation to use motor oils is that: always use the motor oil viscosity recommended by your vehicle manufacturer. Using a different viscosity (thinner or thicker) may cause oil pressure and oil supply problems, especially in late-model engines with cylinder deactivation and/or variable valve timing (VVT).
The main motor oils for today commercial trucks heavy-duty engines are SAE 15W-40, 10W-30, 10W-40, 5W-40, 5W-30 and HTHS viscosity to be 3,0-4,2 мPа·с.
The main motor oils for today passengers cars are 0W-20, 0W-30, 10W-30, 5W-20, 5W-30 and HTHS viscosity 2,6-3,1 мPа·с.
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