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Marine Lubricants (continued) oil because of the drastic reduction in the amount of fresh oil makeup. In addition, the operating practice of extending oil drain periods is becoming more prevalent, further increasing demands on the oil. De- Mar XT, with its good base number retention, provides excellent lubri- cation even under these conditions. De-Mar XT performed outstand- ingly in Caterpillar's 3601 single- cylinder engine test, which was used to predict crankcase oil perfor- mance in Cat's high-output diesel engine in marine applications. At the conclusion of the 250-hour test, top land carbon levels (the most critical rating in this application) were very low, and there was no evi- dence of stuck rings. De-Mar XT has been shown to reduce existing deposit levels in en- gines where oils with lower disper- sant characteristics have been used, and it maintains lower deposit levels than are common with conventional oils. In EMD engines, De-Mar XT works to keep the intake ports clean, and ring and cylinder wear has been minimal in all tests. The product is non-corrosive to silver bearings and all other engine metals. De-Mar XT incorporates proven proprietary friction-reducing tech- nology for greater fuel efficiency. Tests of the product in EMD en- gines have demonstrated statistical- ly significant fuel savings when the lube is used in place of a comparable non-friction-reducing oil. These savings will vary depending on en- gine operating conditions. For use in auxiliary engines, Ex- xon's XD-3 Extra, XD-3, and Exxon Heavy Duty engine oils, all API Cat- egory CD/SF oils, are the primary recommendations for engines (such as Cat and Detroit) requiring API CD quality oils. However, De-Mar XT has been proven to provide satisfactory performance in these engines. Detroit Diesel now recog- nizes the increasing use of higher- sulfur-content fuels and allows the use of oils with ash content above 1.0 percent to cope with these fuels. Therefore, De-Mar XT can conven- iently be used to lubricate both main and auxiliary engines. MOBIL Circle 46 on Reader Service Card Mobilgard 570 is a superior quali- ty marine diesel engine cylinder oil formulated to provide outstanding performance in high-output cross- head engines. These highly loaded crosshead diesels are operated on heavy fuel oil with high sulfur con- tent in order to reduce operating costs. Concurrently, advances in en- gine thermodynamics have permit- ted decreases in specific fuel con- sumption from 155 to 125 grams per bhp-hour. These changes in engine design for greater fuel efficiency, the use of higher viscosity residual fuels, and the need for reduced maintenance have increased the re- quirements on crosshead cylinder oil. Mobilgard 570 was developed to provide high load-carrying charac- teristics, improved spreadability, tenacious film retention, and to minimize port and piston deposits. Because of its high alkalinity (70 Total Base Number), it provides better protection against corrosive wear by neutralizing large amounts of strong acids. This oil is compati- ble with oils normally used in the crankcase of crosshead engines. Mobilgard 300 was developed es- pecially for use as a system oil in modern, high-output, crosshead type marine diesel engines. The sys- tem oil must provide adequate lu- brication of the bearings and other moving parts, such as cams and gears, and proper cooling, particu- larly in the pistons in crosshead engines so designed. The recent de- sign trend in these engines has been in the direction of greater specific outputs, which has led to much higher piston operating tempera- tures than were normal for the pre- vious generation of engines. Mobilgard 300 is formulated from highly treated paraffinic base oils that are selected for their thermal stability and oxidation resistance. The inherent base oil characteristics are augmented with a balanced additive package including high- temperature oxidation inhibitors, alkaline detergent-dispersant, and defoamant. The formulation has maximum antiwear properties, good rust protection in the presence of salt water, and excellent water sepa- ration characteristics. The Mobilbard 42 Series of ma- rine lubricating oils has been devel- oped to supplement the Mobilgard 24 Series (30 TBN) oils for the lubrication of modern high-output, medium-speed trunk diesel engines used for the propulsion of ocean- going vessels and ferries. Mobilgard 42 oils have an alkalin- ity level of 40 TBN and are there- fore particularly suitable for engines that show indications of corrosive wear to cylinder liners and/or piston rings. Mobilgard 342 and 442 are diesel engine lubricating oils made from high-quality base stocks, com- bined with specially selected stable additives to provide excellent per- formance under varying loads and temperature conditions. Careful se- lection of base stocks and additives for the Mobilgard 42 Series has resulted in an engine oil with well- balanced properties. The Mobilgard 24 Series oils were developed originally to meet the re- quirements of medium-speed, trunk piston diesel engines used for main propulsion and as auxiliary drives on deepsea ships, and a main pro- pulsion engines on coastal and river vessels. The Series was reformu- lated recently to provide improved performance in the new, higher-out- put versions of these engines now coming into service. The Mobilgard 24 Series oils are formulated to provide the higher load-carrying ability required to control ring and liner wear in these higher-output engines, and to main- tain satisfactory engine cleanliness regardless of the quality of fuel used. In addition, they will provide improved performance in older de- sign engines where the demands on the lubricating oil are not as severe. Mobilgard SHC 120 is a 12 TBN synthetic, medium-speed diesel lu- bricant. It contains a balanced blend of synthesized hydrocarbons and ester-based fluids, combined with an additive system designed to provide optimum performance in diesel engines. Although its mea- sured viscosity indicates that it is an SAE 40 grade, this oil's inherent high viscosity index enables it to perform similar to an SAE 15W-40 viscosity grade diesel engine lubri- cant. It exceeds the qualification standard for an API CD rated diesel engine lubricant. SHELL OIL Circle 47 on Reader Service Card A wide range of Shell Oil Compa- ny's marine lubricants is available at main ports throughout the world. The more important grades, in- tended for the lubrication of diesel engines, are described below, to- gether with an indication of their principal applications. Shell Alexia oils are for lubrica- tion of large marine crosshead-type diesel engines. They have excep- tional acid-neutralizing powers and are specially designed to combat high cylinder wear in engines burn- ing heavy fuel oil. They also have outstanding cleanliness properties that enable them to minimize de- posit formation on pistons and in cylinders. Shell Melina oils are highly versa- tile, multipurpose heavy-duty lubri- cants specifically designed to meet crankcase/system oil requirements of high-, medium-, and low-speed engines used both for main propul- sion and auxiliary power generation. They are also suitable for many items of oil-lubricated, ancillary shipboard machinery. Melina S oil gives the same level of protection as Melina oil in low-speed engines, only without the additional per- formance for use in auxiliary en- gines, and is thus lower in cost. Shell Bela oil is a system oil for low-speed crosshead engines. It con- tains additives that give protection against rust and oxidation. In addi- tion, it has good compatibility with water so that, if necessary, it can be water-washed safely. Shell Argina oils are combined cylinder and bearing system oils for highly rated, medium-speed trunk type engines burning heavy fuels. Argina T is the primary grade for most applications. Argina X oil is specially fortified for certain high basicity requirements. Argina S oil is designed for auxiliary engines burning lower-viscosity thin fuel oils, where sulfur levels are more moderate. Shell Gadinia oils are combined cylinder and bearing system oils for highly rated medium-speed and high-speed engines. Shell's BHGJ8616401 is designed for en- gines burning distillate fuels only. They are also multi-functional suit- able for many other shipboard ma- chinery applications. Rimula oils are fully detergent, special-duty oils having outstanding anti-wear and protective properties. They are highly resistant to oxida- tion, and are designed to retard the onset of ring sticking, and preserve engine cleanliness under severe con- ditions. Shell Caprinus q>ls, although they contian additives to provide alkalin- ity, dispersance, and resistance to oxidation, contain no zinc additive and thus may be used in engines fit- ted with silver parts. TEXACO Circle 48 on Reader Service Card Texaco's Marine Star Lubricants are offered in a variety of formula- tions that are available worldwide to meet the needs of all types of ma- rine diesel engines. TARO Special is a premium qual- ity cylinder lubricant for large, low- speed crosshead diesels burning heavy residual fuels. It is blended from highly refined, mixed napthen- ic and paraffinic base oils and oil- soluble additives to produce a very high alkaline reserve product (70 TBN) with good lubricant film strength. This product is approved by the major marine crosshead engine manufacturers. TARO Special has been extensively field tested and has given excellent performance when used under the most severe operating conditions. It is specially formulated to prevent corrosive wear that can result from the use of high-sulfur fuels. In addition, the high-quality base oils and high de- tergent level of TARO Special helps minimize ring belt deposits. Viscosi- ty Grade is SAE 50. DORO AR 30 is a premium crank- case lubricant for large low-speed crosshead engines. This product, blended from highly refined solvent neutral oils and carefully selected additives to produce a moderate al- kaline reserve (6 TBN) oil, provides good water separability, anti-wear, and rust and oxidation inhibition. The specially selected high-temper- ature anti-oxidant makes DORO AR 30 particularly suited for those engines using oil-cooled pistons and for applications using the circulat- ing oil for turbocharger lubrication. The TARO XD oils are Texaco's medium-alkalinity (15 TBN) diesel engine crankcase lubricants for me- dium- and high-speed trunk type engines operating on fuels with sul- fur contents up to 1.8 percent. Blended from carefully refined base oils in combination with a specially developed additive package, TARO XD is an API CD level product meeting all the major diesel engine manufacturers' requirements for this type of engine oil. TARO XD has been extensively tested under both laboratory and field environments. It provides ex- cellent engine cleanliness as a result of its carefully balanced detergent system, and prevents engine corro- sion by neutralizing acidic combus- tion products. The excellent TBN retention characteristics of this product provide long in-life service. 48 Maritime Reporter/Engineering News
