AeroShell Oils and AeroShell W Oil is intended for use in
four-stroke cycle aircraft reciprocating piston engines. The
term “ashless dispersant” was given to aviation oils to
distinguish them from straight mineral aircraft piston engine
oils. Because of the negative effect of ash on aircraft engine
performance, it is very important that ash-containing oils are
NOT used in an aircraft piston engine.
Aviation Piston Oils
Shell Aviation can offer a range of aviation greases designed to fill almost every lubrication need of the aviation community. There follows very brief descriptions of the major products in the AeroShell Grease range.
For the majority of aircraft piston engines the selection of the
right grade is important to maximize engine performance and
engine life. The AeroShell Oil and AeroShell Oil comes in four
grades: 65 and W65; 80 and W80 and W80 Plus; 100 and W100 and
W100 Plus; 120 and W120. The grades differ only by viscosity and
thus cover the needs of all
reciprocating engines now in airline and general aviation
operation.
Frequent oil changes specified by engine hour time limits and
calendar time limits are necessary and not caused by the oil
wearing out but by the by-products contaminating the oils such
as: water, dust, dirt and unburned fuel. Operators are urged to
follow the engine manufacturers’ or rebuilders’ recommendation
for oil change intervals to avoid the damaging lead sludge found
in engines that can shorten engine life and possibly void
warranty work by the engine manufacturer.