With the correct oil friction losses in an engine are reduced to a minimum. This is done by taking into consideration circumstances as engine usage, ambient temperature, time of year and climate, location and engine design. The engine manufacturer usually recommends a certain type of oil to use with regard to different circumstances.
Lubricating oil plays an important part in the life of the engine and during maintenance it will be replaced, on certified aircraft the pilot can only replenish it. Without it the engine would fail within minutes, keeping a watchful eye during flight is therefore important.
Having a basic understanding of engine oil is a must for the professional and private pilot, here we can only scratch on the surface of a very interesting subject.
AeroShell supplies the aviation sector with a number of products, ranging from fuel to piston and turbine engine oil. On these pages we discuss the most common types.
Straight Grade Engine Oils
AeroShell Oils 65, 80, 100 and 120 are straight mineral oils blended from selected high viscosity index base oils. These oils do not contain any additives except for very small amounts of pour point depressant (which aids to improve fluidity at very low temperatures) and an antioxidant. AeroShell Oils 65, 80, 100 and 120 are approved for all aviation piston engines of civil aircraft when the use of an oil not containing a dispersant additive is required; however, they should also be used during the break-in of a new aviation piston engine or those recently overhauled.
The specially blended High Viscosity Index base oils in AeroShell Oil 65, 80, 100 and 120 have been designed to provide effective protection to engine components compared to conventional mineral oils. This ensures complete confidence and peace of mind knowing that your aircraft will perform reliably in between scheduled overhauls.
AeroShell Oils 65, 80, 100 and 120 are produced to meet fully the SAE specification J-1966 (Grades SAE 30, 40, 50 and 60 respectively). Furthermore, they all have military qualification approval and are listed on the Qualified Products List (QPL) issued by the US Navy and on the Technically Acceptable Products List (TAPL) issued by the UK Ministry of Defense. The blending plants employed to manufacture these oils also hold the approval of the specification authorities and this ensures that the high quality standard is always maintained.
High Viscosity Index Base Oils used in AeroShell oils maintain their viscosity and protect engine components more effectively under the high shear stresses that an engine places on lubricants. Approved for all reciprocating engines of civil aircraft used for running in operations or older generation engines requiring non additive type engine oils (refer to manufacturers recommendations). Provides Compatibility with other approved aircraft piston engine oils.
Since AeroShell Oils 65, 80, 100 and 120 are fully approved to SAE J-1966 and are listed on the relevant Qualified Products List (QPL), elaborate precautions are not needed when changing from similarly approved aircraft engine oils, as long as these oils are qualified products. AeroShell Oils are inherently stable in storage. Providing that they have been stored and handled correctly, prolonged storage does not have any effect on their quality, properties or performance.
More info in this AeroShell Piston Engine Oil document.
Table below shows some common specification of these straight grade oils:
|Description Units||AeroShell Oil 80||AeroShell Oil 100||AeroShell Oil 120|
|Visual appearance||clear and bright||clear and bright||clear and bright|
|Density at 15 °C kg/L||0.892||0.896||0.898|
|Viscosity at 100 °C mm2/S||14.6||19.7||24.8|
|Viscosity at 40 °C mm2/S||150||230|
|Pour point °C||below -17||below -17||below -11|
|Flash point (COC) °C||above 240||above 250||above 250|
|TAN mg KOH/g||< 0.1||< 0.1||< 0.1|
|SAE J-1966||SAE 40||SAE 50||SAE 60|
|US MIL-L-6082E (obs)||Grade 1080||Grade 1100||Grade 1120|
|(British) DERD 2450 (obs)||A/O||B/O|
|(French) AIR 3560/D||Grade 80||Grade 100|
|NATO||0-115 (obs)||0-117 (obs)|
|Joint service designation||OMD-170||OMD-270||OMD-370 (obs)|