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2. Motor oil - Wikipedia

   en.wikipedia.org/wiki/Motor_oil

   By the mid-1980s, recommended viscosities had moved down to 5W-30, primarily to improve fuel efficiency. A typical modern application would be Honda motor's use of 5W-20 (and in their newest vehicles, 0W-20) viscosity oil for 12,000 kilometres (7,500 mi).

3. EN 590 - Wikipedia

   en.wikipedia.org/wiki/EN_590

   The EN 590 had been introduced along with the European emission standards.With each of its revisions the EN 590 had been adapted to lower the sulphur content of diesel fuel – since 2007 this is called ultra-low-sulphur diesel as the former function of sulphur as a lubricant is absent (and needs to be replaced by additives).

4. Shell Rotella - Wikipedia

   en.wikipedia.org/wiki/Shell_Rotella

   The line includes engine oils, gear oils and coolants. The oil carries both the American Petroleum Institute (API) diesel "C" rating as well as the API gasoline engine "S" rating. Ratings differ based on the oil. Rotella oils, like the T3 15W-40, meet both the API CJ-4 and SM specifications, and may be used in both gasoline and diesel engines.

5. Diesel fuel - Wikipedia

   en.wikipedia.org/wiki/Diesel_fuel

   Diesel is a high-volume product of oil refineries. [2] In many countries, diesel fuel is standardized. For example, in the European Union, the standard for diesel fuel is EN 590. Ultra-low-sulfur diesel (ULSD) is a diesel fuel with substantially lowered sulfur contents. As of 2016, almost all of the petroleum-based diesel fuel available in the ...

6. Winter diesel fuel - Wikipedia

   en.wikipedia.org/wiki/Winter_diesel_fuel

   Diesel fuel is prone to waxing or gelling in cold weather; both are terms for the solidification of diesel oil into a partially crystalline state. Below the cloud point the fuel begins to develop solid wax particles giving it a cloudy appearance. The presence of solidified waxes thickens the oil and clogs fuel filters and injectors in engines.

7. Ash (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Ash_(chemistry)

   Ash-forming materials are considered to be undesirable impurities or contaminants. In the ash analysis of petroleum products, ash content represents the incombustible component remaining after a sample of the furnace oil is completely burned. The ash content of petroleum products is generally low.