What is the lubricant used for the Main Reduction Gear (MRG)?

The lubricant used for the Main Reduction Gear (MRG) is specifically designed to handle the demands of high-load, high-performance gear systems found in marine applications. 2190 TEP (Turbine Engine Oil) is formulated to provide excellent anti-wear protection, lubrication under extreme conditions, and compatibility with the materials used in marine gear systems.

This choice is ideal because MRGs operate in environments where both temperature variations and mechanical stress are significant. The properties of 2190 TEP ensure that it can facilitate smooth operation while reducing the risk of gear wear and failure, which is critical for maintaining the performance and reliability of marine propulsion systems.

The other options do not meet the specific requirements of MRG lubrication. SAE 30 is a general-purpose motor oil and may not provide the extreme pressure protection needed. Mobil 1, while a high-performance synthetic oil, is not tailored specifically for MRGs. Marine grease is typically used for sealing and protecting components but does not possess the flow characteristics or additives suited for the high-speed and high-load bearings of reduction gears.