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An oil is any nonpolar chemical substance that is a viscous liquid at ambient temperatures and is both hydrophobic (does not mix with water, literally "water fearing") and lipophilic (mixes with other oils, literally "fat loving"). Oils have a high carbon and hydrogen content and are usually flammable and surface active.
The general definition of oil includes classes of chemical compounds that may be otherwise unrelated in structure, properties, and uses. Oils may be animal, vegetable, or petrochemical in origin, and may be volatile or non-volatile. They are used for food (e.g., olive oil), fuel (e.g., heating oil), medical purposes (e.g., mineral oil), lubrication (e.g. motor oil), and the manufacture of many types of paints, plastics, and other materials. Specially prepared oils are used in some religious ceremonies and rituals as purifying agents.

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  1. jleavy1977

    Incorrect Oil, Dieseling

    Long time reader, first time poster; please advise if this topic is covered elsewhere. I have mistakenly placed the wrong kind of oil into a break-barrel nitro piston Crosman Valiant .177 air rifle and it is now dieseling and as loud as a rimfire .22 pistol, was super quiet before. I don’t...
  2. Ironbar

    Still Change Your Own Oil?

    A long time ago when I owned my first car- yes. Later on when it was less hassle and expense going to oil change place- no. Nowadays with this rig, oil changes are up around the $90.00 range, so it's back to doing it myself, especially since I now work for a company where I can get synthetic...
  3. fredball

    The Quality of Oil Filters- or- The Lack of Quality

  4. mikemenzie

    Lube/Rust Prevention Test That Can't be Shared Enough

    I've been looking into the possibility of changing my routine of Hoppe's #9 followed by Hoppe's Gun Oil, and came across this study a fella did. This was super impressive to me, and I thought someone else might benefit. Results of gun care product evaluation - The Firing Line Forums From...
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