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2. Antiwear additive - Wikipedia

   en.wikipedia.org/wiki/Antiwear_additive

   AW additives, or antiwear additives, are additives for lubricants to prevent metal-to-metal contact between parts of gears. [ 1 ] EP additives are used in applications such as gearboxes , while AW additives are used with lighter loads such as bushings .

3. Two-stroke oil - Wikipedia

   en.wikipedia.org/wiki/Two-stroke_oil

   The oil is dyed blue to make it easier to recognize in the gasoline. It appears black in this bottle because it is not diluted. Two-stroke oil (also referred to as two-cycle oil, 2-cycle oil, 2T oil, or 2-stroke oil) is a special type of motor oil intended for use in crankcase compression two-stroke engines, typical of small gasoline-powered ...

4. List of abbreviations in oil and gas exploration and production

   en.wikipedia.org/wiki/List_of_abbreviations_in...

   PP – DXC pressure plot log [clarification needed] PP – pump pressure; PPA – Pounds of Proppant added; PP&A – permanent plug and abandon (also P&A [citation needed]) ppb – pounds per barrel; PPC – powered positioning caliper (Schlumberger dual-axis wireline caliper tool) [24] ppcf – pounds per cubic foot; PPD – pour point depressant

5. Heavy crude oil - Wikipedia

   en.wikipedia.org/wiki/Heavy_crude_oil

   Heavy crude oil (or extra heavy crude oil) is highly viscous oil that cannot easily flow from production wells under normal reservoir conditions. [1] It is referred to as "heavy" because its density or specific gravity is higher than that of light crude oil. Heavy crude oil has been defined as any liquid petroleum with an API gravity less than ...

6. Motor oil - Wikipedia

   en.wikipedia.org/wiki/Motor_oil

   The oil and the oil filter need to be periodically replaced; the process is called an oil change. While there is an entire industry surrounding regular oil changes and maintenance, an oil change is a relatively simple car maintenance operation that many car owners can do themselves.

7. Drilling fluid - Wikipedia

   en.wikipedia.org/wiki/Drilling_fluid

   Emulsions: The two types used are oil in water (oil emulsion muds) and water in oil (invert oil emulsion muds). Oil based mud: Oil based muds contain oil as the continuous phase and water as a contaminant, and not an element in the design of the mud. They typically contain less than 5% (by volume) water.