Mobil Pegasus 805 – Premium Performance Gas Engine Oil (SAE 40)

High-Performance Low-Ash Lubricant for Modern Four-Stroke Natural Gas Engines

Product Overview

Mobil Pegasus 805 is a premium-quality, high-performance, natural gas engine oil specifically engineered to meet the rigorous demands of four-cycle spark-ignited gas engines operating under high load, high temperature, and low-emission environments. With a robust additive system, it is formulated from high-quality mineral base stocks to deliver excellent performance in terms of wear protection, deposit control, oxidation resistance, and valve seat protection.

Designed for applications that demand low-ash content, this oil is especially suited for engines operating on natural gas, landfill gas, and other clean gaseous fuels. Mobil Pegasus 805 offers consistent engine cleanliness, reduced maintenance downtime, and superior protection for both legacy and modern gas engine technologies—including turbocharged and high-output engines with advanced valve designs.

With approvals from major engine manufacturers and compliance with international standards, Mobil Pegasus 805 is the trusted choice for industrial and power generation users seeking optimized uptime and reliability.

Key Benefits

1. Advanced Oxidation and Nitration Resistance

Mobil Pegasus 805 is engineered to resist thermal degradation and chemical attack caused by high-temperature operation and combustion byproducts. Its strong oxidation and nitration control extend oil life, reduce oil thickening, and limit harmful deposit formation in pistons, valves, and combustion chambers. This makes it especially effective in lean-burn or turbocharged engines that operate under intense thermal loads.

2. Proven Anti-Wear and Anti-Scuff Performance

This oil provides a strong protective film that guards engine components such as camshafts, pistons, liners, and bearings from metal-to-metal contact and wear. It ensures long service intervals and minimizes the risk of scoring or scuffing, especially in engines operating under high loads or intermittent service conditions.

3. Low-Ash Technology for Emissions Systems Compatibility

With its controlled low-ash formulation (~0.5% sulfated ash), Mobil Pegasus 805 is ideal for engines equipped with catalytic converters, exhaust gas recirculation (EGR) systems, and other emission-reducing technologies. It reduces the risk of ash-related buildup on spark plugs and exhaust components, promoting cleaner combustion and longer catalyst life.

4. Superior Valve Train Protection

Mobil Pegasus 805’s detergent and anti-wear chemistry ensures reliable protection against valve recession and seat erosion—critical for extended engine operation at high speeds and loads. It supports engines running with high compression ratios or using alternative fuel blends where valve wear is often a limiting factor.

5. Excellent Detergency and Engine Cleanliness

A high-quality dispersant and detergent system helps prevent the formation of sludge, varnish, and carbon deposits. The oil maintains cleanliness throughout the engine, contributing to reduced maintenance and improved component longevity—especially in intake and exhaust systems.

Applications

Mobil Pegasus 805 is widely used in a range of industrial gas engine applications, including:

Power Generation

Used in gas-fired power plants and cogeneration systems (CHP) where engines run continuously at high load factors. It provides excellent protection and supports longer drain intervals, reducing total cost of ownership.

Oil and Gas Industry

Suited for natural gas compressors and engines at field gathering sites, including those operating on sour gas or associated petroleum gas with low H₂S levels. Its ability to handle corrosive conditions and maintain viscosity under pressure makes it ideal in this sector.

Municipal and Utility Services

Recommended for engines used in wastewater treatment plants, landfill gas recovery systems, and district heating operations where fuel contaminants or irregular engine loads are common.

Industrial Engines

Compatible with four-cycle natural gas engines used for industrial pumping, air compression, and standby power in manufacturing facilities and remote sites.

Specifications and Approvals

Mobil Pegasus 805 meets or exceeds the following engine OEM specifications:

• Caterpillar Energy Solutions TR 2105

• MWM (now Caterpillar) TR 0199-99-2105

• INNIO Jenbacher Types 2, 3, 4, 6 (Class A and B fuel gas)

• Waukesha 220GL series and pipeline-quality fuel gas engines

• MAN Energy Solutions for medium-speed 4-stroke LNG engines

• Rolls-Royce / MTU Series 400 gas engines

• Perkins Natural Gas Engine Oil specification

• Wärtsilä 220SG, 28SG, 32DF, 34SG series

Typical Physical Properties

Note: Actual values may vary slightly depending on production batch.

Performance Summary

Mobil Pegasus 805 is a well-balanced gas engine lubricant offering:

• Reliable long-term performance in four-stroke engines

• Exceptional deposit and sludge control

• Low oil consumption and emissions system protection

• Compatibility with sensitive emission-control hardware

• Reduced maintenance and improved operating efficiency

Storage and Handling

Store in a dry, covered environment between 0°C and 40°C. Avoid contamination with water, dust, and other lubricants. Keep containers sealed when not in use. Dispose of used oil responsibly at an authorized recycling or collection facility.

Mobil Pegasus 805 is the lubricant of choice for operators of four-stroke gas engines who demand engine longevity, reduced maintenance, and environmental compliance. Its excellent wear control, deposit management, and low-ash formulation make it perfectly suited for today’s high-efficiency engines—especially those operating under emission restrictions or using sensitive aftertreatment devices.

From power generation plants to municipal infrastructure and energy sector engines, Mobil Pegasus 805 consistently delivers reliable performance, reduced downtime, and optimized total cost of ownership. Backed by ExxonMobil’s global expertise and supported by an extensive distribution network, it stands out as a benchmark in the gas engine lubricant category.