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2. Valvoline Instant Oil Change - Wikipedia

   en.wikipedia.org/wiki/Valvoline_Instant_Oil_Change

   Valvoline Instant Oil Change is a company that provides preventive maintenance services for many different types of automobiles. These services include oil changes, antifreeze changes, differential fluid changes, batteries, belts, fuel system cleaning service, lights, wipers and transmission fluid changes, and in states where services are ...

3. Valvoline - Wikipedia

   en.wikipedia.org/wiki/Valvoline

   Valvoline received commendations by Charles F. Chandler and others at the Paris Exhibition of 1878. [7] By the 1890s, Valvoline oil was associated with winning race cars. [8] During the early 20th century, Valvoline was the recommended motor oil for the Ford Model T. [4] In 1949, Ashland Inc. purchased the Freedom-Valvoline Company. [9]

4. Gear oil - Wikipedia

   en.wikipedia.org/wiki/Gear_oil

   For example, most modern gearboxes require a GL-4 oil, and separate differentials (where fitted) require a GL-5 oil. While they take the same form, the viscosity grades for gear oils are on a different scale than the viscosity grades for an engine oil. The viscometrics for gear oils are standardized in SAE J306.

5. Grain per gallon - Wikipedia

   en.wikipedia.org/wiki/Grain_per_gallon

   The grain per gallon (gpg) is a unit of water hardness defined as 1 grain (64.8 milligrams) of calcium carbonate dissolved in 1 US gallon of water (3.785412 L). It translates into 1 part in about 58,000 parts of water or 17.1 parts per million (ppm). Also called Clark degree (in terms of an imperial gallon).