Mobilgard™ 12 Series diesel engine oil

Mobilgard™ 12 Series high-performance diesel oils are designed for use in marine trunk piston engines operating on low sulphur distillate fuels. The oils are compatible with ExxonMobil Premium ECA category fuels. They provide outstanding corrosion and wear protection, as well as helping engine cleanliness and water separation properties.

Mobilgard™ 312 and Mobilgard™ 412 are particularly effective in small bore, high-speed engines in fishing fleets; in new, severe service engines; and in many types of medium-speed engines.

Potential benefits of Mobilgard 12 Series oils include:

Extended periods between inspections, overhaul and cleaning
Reduced ring and liner wear
Increased protection against corrosive wear
Increased oil service life and cleaner engines

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Data Sheet

Product data sheet (PDS)

Safety data sheet Mobilgard 312 (SDS)

Safety data sheet Mobilgard 412 (SDS)

Product Information

Mobilgard™ 12 Series performance profile

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Technical resources

Guidelines for switchover to ExxonMobil marine lubricants

Learn about five different circumstances related to switching and mixing ExxonMobil marine lubricants.

Storage and handling: Best practices and guidelines for marine lubricants

Learn more about best practices for handling, storing and dispending ExxonMobil marine lubricants

Features and Benefits

Mobilgard 12 Series is formulated with base oils having proven successful performance in diesel engines. The additive system is balanced to provide excellent resistance to thermal degradation under moderately severe operating conditions. They also provide good engine cleanliness and superior wear protection.

When used as recommended, Mobilgard 12 Series oils provide the following features and potential benefits:

Features	Advantages and Potential Benefits
Excellent thermal and oxidation stability	Extended periods between inspections, overhaul and cleaning
Improved antiwear properties	Reduced ring and liner wear
Excellent TBN reserve and retention	Increased protection against corrosive wear
Excellent detergency/dispersancy properties	Increased oil service life Cleaner engines

Applications

The Mobilgard 12 Series diesel engine oils are intended for use as cylinder and bearing lubricants in marine and industrial diesel engines operating on distillate fuels or light fuel blends. They are particularly effective in high speed engines in fishing fleets; in new, severe service engines; and in many types of medium speed engines. They may be used as crankcase lubricants in large crosshead type diesel engines operating on high sulphur fuels.

Typical Properties

	312	412
SAE Grade	30	40
Specific Gravity at 15ºC	0.896	0.899
Flash Point, ºC, ASTM D 92	266	272
Pour Point, ºC, ASTM D 97	-9	-9
Viscosity, ASTM D 445
cSt, at 40ºC	108	142
cSt, at 100ºC	12.0	14.5
Viscosity Index, ASTM D 2270	100	100
TBN, mg KOH/g, ASTM D 2896	15	15
Sulphated Ash, wt%, ASTM D 874	2.1	2.1