Shell Aero Ascender
Shell Aero Ascender is a fourth-generation turbine engine oil developed using a high-performance, low-coking 5 mm²/s synthetic hindered ester basestock combined with a state-of-the-art additive system. It has been specifically engineered to improve thermal and oxidation stability while providing superior elastomer compatibility, addressing two traditionally conflicting performance requirements in turbine oil technology.
The defining advantage of Shell Aero Ascender lies in its ability to deliver both ultra-low coking performance and excellent seal compatibility. Historically, improving coking resistance often resulted in compromised elastomer performance, leading to seal degradation and increased oil consumption. Shell Aero Ascender resolves this trade-off by offering a balanced formulation that reduces the risk of coke formation in bearing chambers and service pipes while maintaining seal integrity. This helps operators avoid premature seal replacement and associated maintenance costs.
The oil’s low-coking performance ensures negligible coke formation, even in high-temperature bearing areas where traditional oils may be stressed beyond their thermal limits. This reduces maintenance and cleaning requirements, lowers operating costs and enhances overall engine reliability. In addition, improved oxidation and thermal stability contribute to extended oil life during demanding engine conditions, supporting longer service intervals.
Extensive elastomer compatibility testing has demonstrated excellent performance across a wide range of seal materials, including fluorocarbon, nitrile, silicone and perfluoroelastomer types. Reduced seal swell and degradation help control oil consumption and maintain system efficiency throughout the service life. Shell Aero Ascender is also fully compatible with other approved turbine oils, allowing straightforward changeover without operational concerns.
Classified as a High Performance Capability (HPC) grade oil under SAE AS5780B and approved to MIL-PRF-23699F HTS, Shell Aero Ascender meets stringent international aviation specifications. It is approved by major engine manufacturers including Pratt & Whitney (521C Type II), General Electric (D-50 TF 1) and IAE (V2500 Series). Equivalent approvals include DEF STAN 91-101 and DCSEA 299/A, with NATO Code O-154.
Shell Aero Ascender is designed for the latest generation of gas turbine engines and also delivers performance benefits in existing high-powered, high-compression engines where enhanced thermal stability and low deposit formation are critical
