Mobilgard 300

Nhớt Động Cơ Mobilgard 300
Diesel Engine System Oil
Product Description
Mobilgard 300 by ExxonMobil is a premium quality, extra high performance system oil designed for crosshead
diesel engines. High quality paraffinic base oils along with a balanced additive system provide excellent protection
even for the severe operating conditions of the latest design, high-output crosshead marine diesel engines. This
product has sufficient alkalinity to neutralise any strong acids which may find their way into the crankcase from
the combustion of fuel sulphur, and it has enhanced load carrying ability in order to reduce wear in heavily loaded
Features and Benefits
Mobilgard 300 is formulated from high quality paraffinic base oils that have excellent thermal stability and oxidation
resistance. These base oil characteristics are augmented with a balanced additive system that includes special
high temperature oxidation inhibitors, alkaline detergents, a load carrying component and defoamant. The
formulation has maximum antiwear properties, good rust protection in the presence of salt water, and excellent
water separation characteristics.
When used as recommended in crosshead type diesel engines, Mobilgard 300 system oil offers the following
features and potential benefits:
Features Advantages and Potential Benefits
Reduced deposits in piston cooling spaces and
crankcaseBetter piston cooling efficiency
Improved thermal and oxidation stability
Enhanced detergency Cleaner crankcases and circulation tanks
Excellent rust and corrosion properties Longer bearing lifeProtects critical bearing surfaces
Effective lubrication in the presence of waterLonger oil
life due to efficient water separation
Good water tolerance and separation capability
Mobilgard 300 is recommended primarily for use as system oil in late model, high-output, crosshead diesel
engines, especially those engines employing the system oil for piston cooling. It will prevent or reduce deposit
formation in the piston cooling spaces, thus maintaining piston cooling efficiency and reducing the incidence of
piston top burning and piston crown cracking. It will also prevent or reduce crankcase deposits and will provide
outstanding protection for heavily loaded bearings. Its reserve alkalinity allows for the burning of high sulphur
fuel. Good rust prevention and water separation characteristics make Mobilgard 300 an excellent system oil in
older design crosshead diesel engines which have water-cooled pistons and where crankcase deposits can be
a problem with lower-quality system oils.
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Typical Properties
SAE Grade 30
Specific Gravity at 15ºC 0.889
Flash Point, ºC, ASTM D 92 266
Pour Point, ºC, ASTM D 97 -12
Viscosity, ASTM D 445
cSt, at 40ºC 111
cSt, at 100ºC 12
Viscosity Index, ASTM D 2270 97
TBN, mg KOH/g, ASTM D 2896 5
Sulphated Ash, wt%, ASTM D 874 0.73
Health and Safety
Based on available information, this product is not expected to produce adverse effects on health when used
for the intended application, following the recommendations provided in the Material Safety Data Sheet (MSDS).
MSDSs are available upon request through your sales contract office, or via the Internet on 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 logotype and Mobilgard are trademarks of Exxon Mobil Corporation, or one of its subsidiaries.
ExxonMobil Lubricants & Specialties
All products may not be available locally. For more information, contact your local sales office 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. Due to continual product
research and development, the information contained herein is subject to change without notification. Typical Properties may vary slightly.
© 2007 Exxon Mobil Corporation. All rights reserved.
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