Different Piston and Turbine Engine oils (abbreviated as PEO and TEO respectively) form a type of lubricants used in general aviation, commercial and military aircraft engines, automotive, marine engines and other industrial applications,
Piston engine oils (PEO) used on aircraft, automobile or other engines keep them performing well and in good condition.They reduce friction between engine moving parts, protect against shocks, cool internal areas, prevent rust and corrosion in highly finished internal parts, and keep the inside of the engine clean. They are generally made up of mineral oils fortified with materials such as non-metallic salts enabling them able to withstand the conditions of their intended function.They can also include different additives enhancing their properties to meet a wider range of requirements.
Turbine engine oils (TEO), also known as jet oils, turbo oils are specialty lubricants designed to support the operation of aviation and industrial turbines. Apart from their lubricating function of the engine,  gearbox, shafts and associated accessories, TEOs have two additional functions. Their various additives protect the components from corrosion, and filter contaminants in the engine such as carbon deposits (coking) while they are also used as heat transfer fluids, cooling the engine in temperatures reaching 1000°C, and extending in turn the life of the oil up to 25,000 hours of operation. TEOs have been initially developed as mineral and subsequently innovated to synthetic.
MIL-PRF-23699/SAE AS5780 Aircraft Turbine Engine Oils
Turbine engine oils (TEO) used on commercial aircraft and general aviation engines are conforming with the US military specification MIL-PRF-23699 (formerly MIL-L-23699), an essential step in the process of gaining engine equipment manufacturer approval in different engine, engine accessories and auxiliary power unit types. Although primarily a military specification, MIL-PRF-23699 has served the commercial aviation sector since the 1960s and is still used today.  
This specification covers four oil  categories mentioned below. Most engines run well on STD/SPC oils. HTS/HPC oils offer improved temperature capabilities (engine cleanliness) but at the cost of lower elastomer compatibility & higher prices. 
STD – Standard
HTS – High Thermal Stability
C/I – Corrosion Inhibited (for military use only). Oils in this category include AeroShell Turbine Oil 531, Eastman Aero-D, NYCO Turbonycoil 601 and Castrol AeroJet 5.
EE – Enhanced Ester
In the case of TEOs, hotter running engines with extended times between overhauls are not adequately covered by MIL-PRF-23699 for the type of oil needed in modern commercial engines requiring additionaly tighter controls
In 2005, SAE (Society of Automotive Engineers) has issued SAE AS5780 to replace MIL-PRF-23699 defining two grades of oil:
SPC – Standard Performance Capability, almost identical to STD except for additional reporting items.
HPC – High Performance Capability. SAE HPC grade has more stringent performance requirements compared with the MIL-PRF-23699 HTS grade.
Most commonly used aircraft turbine engine oil brands fall under both MIL-PRF-23699 and SAE AS5780 specifications in the respective categories. 
Examples: 
- STD/SPC: Castrol 500 (*),AeroShell 500, AeroShell 560,Mobil Jet II, etc.
(*) Castrol™ 5000 Aircraft Synthetic Turbine Oil is replaced by other 5 centistoke gas turbine oils in the MIL-PRF-23699 STD category.
- HTS/HPC: Mobil Jet Oil 254, Eastman 2197, etc. 
Furthermore, certain oils comply with different specifications to those of MIL-PRF-23699 or  SAE AS5780.

An extensive range of piston and turbine engine oils are listed in our Web Platform for Supplies (shop.aviationeu.supplies) and can be supplied to customers in different packing options, due to our co-operations with their respective producers or distributors. If your oil is not listed please contact us for assistance or a quotation.