Mobilgard 409 NC

ExxonMobil marine , Canada

Marine Crankcase Oil

Product Description

Mobilgard 409 NC (No Chlorine) engine oil by ExxonMobil is a non-zinc and non-chlorine lubricant formulated with high-quality basestocks which provide low oil consumption characteristics, high-temperature oxidation resistance, and thermal stability. These basestocks are combined with an Electro Motive Diesel (EMD) and General Electric (GE) endorsed additive package, resulting in an engine oil with well-balanced properties.

The optimized additive formulation in Mobilgard 409 NC has reduced ash content and advanced dispersant technology. Its alkalinity reserve provides excellent corrosion protection when using fuels containing up to 0.05 wt.% sulfur, including low and ultra low sulfur diesel fuels, even though metals such as steel, copper, silver and bronze are present. It has outstanding lubricating properties and is optimized for low and ultra low sulfur fuel use and takes into account after-treatment technologies. Mobilgard 409 NC exhibits good wear control for piston rings and cylinder liners. 


Features and Benefits

When used as recommended, Mobilgard 409 NC provides the following features and potential benefits:

FeaturesAdvantages and Potential Benefits
High thermal and oxidation stabilityHelps protect against sludge formation in intermittent marine service, providing clean, smooth running engines
Effective anti-wear and load carrying propertiesHelps protect critical wear surfaces and extend engine life
Helps reduced sulfated ash content
Formulated for use with low and ultra low sulfur diesel fuel
Advanced dispersant technologyHigh soot loading capability
Superior cleanliness in engines with lower lube oil consumption rates
High Viscosity IndexHelps reduce oil consumption
Excellent TBN Reserve and RetentionCombats fuel/combustion related corrosion and deposits



Mobilgard 409 NC engine oil has been specifically formulated to meet requirements of heavily loaded diesel engines manufactured by EMD and used in marine applications. It is suitable for other marine diesel engines of the highest horsepower, or higher brake mean effective pressure (BMEP) using distillate fuels with a sulfur content up to 0.05 wt.%.

Mobilgard 409 NC has been approved by EMD and General Electric and is recommended for diesel engines manufactured by Alco, Detroit Diesel and Fairbanks Morse. The newest improvements in General Electric and EMD engines are modified piston rings and cylinder liners that have significantly reduced oil consumption. This drastic reduction in the amount of fresh oil makeup, plus the higher operating temperatures of the newer engines, places an extra burden on the oil. The good base number retention and improved oxidation inhibition of Mobilgard 409 NC provides excellent service under these conditions, even with extended oil drain intervals.


Typical Properties

SAE Grade40
Viscosity, ASTM D 445 
cSt, at 40ºC141
cSt, at 100ºC14.5
Viscosity Index, ASTM D 2270104
Sulphated Ash, wt%, ASTM D 8740.99
Total Base Number, mg KOH/g, ASTM D28969.0
Pour Point, ºC, ASTM D 97-18
Flash Point, ºC, ASTM D 92262
Density @ 15ºC kg/l, ASTM D 40520.889
Zinc, ppm, max10
Chlorine, ppm, max50


Health and Safety

Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. MSDS's are available upon request through your sales contract office, or via the Internet. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.

The ExxonMobil logo and Mobilgard are trademarks of Exxon Mobil Corporation, or one of its subsidiaries.


Imperial Oil 

Petroleum and Chemicals Division
Lubricants and Specialties
240 Fourth Ave SW
C. P. 2480, Station M
Calgary AB T2P 3 M 9



Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification. Variations that do not affect product performance are to be expected during normal manufacture and at different blending locations. The information contained herein is subject to change without notice. All products may not be available locally. For more information, contact your local ExxonMobil contact or visit
ExxonMobil is comprised of numerous affiliates and subsidiaries, many with names that include Esso, Mobil, or ExxonMobil. Nothing in this document is intended to override or supersede the corporate separateness of local entities. Responsibility for local action and accountability remains with the local ExxonMobil-affiliate entities.