Aviation oil additives - Castle Products

Aviation oil additives

By Bill Coleman

The following facts about aviation oil were developed by Harold Tucker, Lubricants Technical Director for the Phillips 66 Company; Dr. Alex Schuettenberg, Senior Research Chemist, Lubricants Technical Support for Phillips 66; and by Richard Fowler, President of America’s Aircraft Engines, Inc.

1. Oil additives wear out.
Technically, oil does not wear out. However, extended use causes an oil’s additives to wear out or become depleted. For example, an ashless dispersant aviation oil is designed to suspend dirt and metal particles picked up from an aircraft engine. Eventually the oil will become "over-suspended." The principal reason oil is changed at regular intervals is to rid the engine of these suspended impurities. Old oil, with a high degree of contaminants, can cause bearing corrosion and deposit buildup. It can also get to the point where it will not suspend the additional particles created during engine operation. This produces particle buildup or sludge. Overworked oil will also result in the depletion of its other additives. The result is that it will be unable to perform with the benefits the additives were designed to provide.

2. Oil removed during an oil change should appear dirty.
If an oil is doing its job properly, it should suspend dirt, metallic wear materials, and unburned carbon. Therefore, when you change your oil it should look much dirtier than it did when first added to the engine. An excellent method for monitoring an oil’s condition is through oil analysis, which can be key to any preventive maintenance program. Oil analysis must be conducted regularly to establish trends of operation. It provides information on wear metals, viscosity integrity, fuel dilution, and air intake system leaks, among other things. As a long-term preventive maintenance tool, it will build a history of the engine’s performance and aid in the detection of possible problems before they become severe.

3. Aircraft engine oil should be changed every 25 operating hours when not using an oil filter.
Phillips 66, like other aviation oil manufacturers, recommends changing aviation oil every 25 hours if an oil filter is not being used. If an oil filter is being used, it should be changed every 50 hours.

4. Off-the-shelf oil additives do not improve aircraft engine performance.
Except in extremely rare instances, original engine manufacturers (OEMs) do not recommend using additives with aviation oil. Changing oil regularly is much more beneficial. Little is to be expected from the inclusion of aftermarket additives to an approved oil, and no OEM recommends their use. These include additives that claim to fortify or enhance the oil’s lubrication properties.

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Popular Q&A

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What is the Weight of aviation oil?

When we did weight and balance on the small piston engine aircraft I trained on we always used 9lb per U.S. gallon

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What are oil additives?

Oil additives are things that can be put in when you add oil into your car so that it helps with the way it runs. Enjoy

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What is the oil viscosity for a 2005 Lincoln aviator?

According to the 2005 Lincoln Aviator Owner Guide :
( 5W-20 )

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