Description:

Shell Argina S is a multifunctional crankcase lubricant for certain medium-speed diesel engines operating on residual, blended or distillate fuels.

Performance, Features and Benefits:

•Engine cleanliness 

Has built a reputation over many years for very good engine cleanliness. 

•Rapid neutralisation of acidic combustion products 

Gives long-term protection against corrosion of ferrous and non-ferrous metals. 

•Thermal stability and resistance to oxidation 

Provides excellent high temperature deposit control and contributes to long oil life. 

•Suitability for centrifugal separators 

High detergency/low dispersancy formulation releases contaminants and water readily in centrifugal separators

Application:

•Medium-speed industrial or marine propulsion and auxiliary engines, burning residual or blended fuel oils, which create conditions of low oil stress. These conditions usually occur: 

-in engine designs more than 5 years old, 

-where oil consumption is 1.5g/kWh or more, or 

-where load factors are below 70%, or 

-where fuels with sulphur <2% are in use. 

•Some medium and high speed engines burning distillate fuel, where a high BN, high ash lubricant is suitable. 
 
•Marine engine reduction gears and certain other ship-board applications, where specialist lubricants are not required. 

Medium-speed engines burning residual fuel, or fuel blends with a residual fuel component, need very specialised lubricants. Heavy fuels contaminate the oil with asphaltenes, requiring special types of detergency to avoid sludges. The combustion of high sulphur fuels produces sulphur acids, which cause high wear rates of piston rings and cylinder liners unless neutralised by a high basicity reserve in the oil. The oil is in service for very long periods, so centrifugal separators are used to remove water and combustion contaminants from the oil. Medium-speed engine oils must be specially designed to release these contaminants in the separator. 

Some engines burning distillate fuel can benefit from a 20 BN lubricant, where the design calls for lubricants of API CF performance and fuel sulphur is >1%. 

Note: Argina S is not recommended for engines where an API CF-4, CG-4, CH-4 or CI-4 oil is required.