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2. Valve oil - Wikipedia

   en.wikipedia.org/wiki/Valve_oil

   There are two main valve types on brass instruments: piston and rotor. Accordingly, vendors sell different types of oil, including scented varieties. Some vendors recommend up to three different types of oil for some valve types. Slide oil for trombones is also a very similar solution. The difference between oil types is primarily the viscosity ...

3. List of viscosities - Wikipedia

   en.wikipedia.org/wiki/List_of_viscosities

   Dynamic viscosity is a material property which describes the resistance of a fluid to shearing flows. It corresponds roughly to the intuitive notion of a fluid's 'thickness'.

4. Valvoline - Wikipedia

   en.wikipedia.org/wiki/Valvoline

   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] By 2016, Ashland's Valvoline subsidiary accounted for about 37% of the parent company's annual revenue. [4]

5. Hydraulic tappet - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_tappet

   A hydraulic tappet, also known as a hydraulic valve lifter or hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. Conventional solid valve lifters require regular adjusting to maintain a small clearance between the valve and its rocker or cam follower .

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. NOV Inc. - Wikipedia

   en.wikipedia.org/wiki/NOV_Inc.

   NOV Tower in the Westchase district of Houston. NOV Inc., formerly National Oilwell Varco, is an American multinational corporation based in Houston, Texas.It is a worldwide provider of equipment and components used in oil and gas drilling and production operations, oilfield services, and supply chain integration services to the upstream oil and gas industry.