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    Special Bulletin! 09/08/09

    Is the Oil Pressure in your Turbo Engine TOO LOW??

    Engines that are turbo charged absorb a hefty percentage of the oil to lubricate the turbo.
    I have seen some that will not maintain 30 to 35 psi at max rpm after warm up.

    Delo 100 is also available in 50 WT. It will give a tired engine some more compression and bring up the Oil Pressure. The heavier viscosity oil will boost the oil pressure and at the same time it could increase your compression in turn helping the engine run cooler and possibly smoke a little less.

    This is not as good as an overhaul by any means, but It is a way to extend the life of an old engine, especially if you do not have the big bucks it takes today to overhaul. I stumbled on to this talking to a West Coast operator who indicated he had been using it for years and he was getting it from an Authorized Genuine Detroit Dealer. I have not attempted to purchase it through the Dealers, but did find some locally at an independent oil distributor.

    NOTE 1: If your engine is maintaining 60 psi at 70 mph and 15 to 20 psi at idle with a warmed up engine, you do not need this weight oil!

    NOTE 2: If you have a non turbo engine that has low oil pressure this will also work in it.

    Technical Data Section: DDC Oil

    Current data posted below reference Sulfated Ash content     Posted 11/26/05- Updated 08/30/06

    Rumors are that the Delo® 400 has been modified and there is no longer a need to use Delo® 100. The following is direct from the Chevron® Web Page

    ChevronTexaco® Global Lubricants
    Improves Market Leading Delo® 400
    Multigrade Diesel Engine Oil

    - New Formulation Reduces Wear,
    Improves Soot Dispersancy and
    Complies With CI-4 Plus Performance Requirements

    Yes the 400 has been modified, BUT the Ash Rate is over the limit of Detroit Diesel® specifications (1.41% to 1.50%) and As of this date does not give the staying qualities of the Delo® 100!!!

    See the comparison posted lower on this page in the Box titled Sulfated Ash Rate Comparison Chart or click on the following link and read the current data sheet for both grades. You will see a Column on the left side of the screen with some Navigation links posted, Below the HEADING titled RELATED LINKS you will find the DATA SHEETS link. After clicking Data Sheets, the next page will appear and you will have to type the word Delo in the top blank, Select which language you desire, and then select country, then click the SEARCH button which will take you to another page of links listing all the Delo® oils, select each one you want and it will come up in a PDF file. I attempted to post the link for each choice to take you directly to the end page. It is site controlled and would only display as an ERROR. This is the link that works Chevron Data Sheet

    Special Bulletin!
    Scarcity of Availability
    Straight 40 WT. Oils
    Information is now posted in NEW page Helpful Tips & Oil Information

    Instructions where to find Locations with MAP & PHONE links.

    Sulfated Ash Rate Comparison Chart Updated 08/30/06

    Detroit Diesel Allison® Lube Oil Recommendations for

    Detroit Diesel® 2-Cycle Engines
    DDC publication 6SA314 8901

    Function of Lubricating Oils

    All diesel engines require heavy duty lubricating oils. Basic requirements of such oils are:

    Lubricating Quality

    The reduction of friction and wear by maintaining an oil film between moving parts is the primary requisite of a lubricant. Film thickness and its ability to prevent metal-to-metal contact of moving parts is related to oil viscosity. The optimums for Detroit Diesel® two-cycle engines are SAE 40 grade oils.

    High Heat Resistance

    Temperature is the most important factor in determining the rate at which deterioration or oxidation of the lubricating oil will occur. The oil should have adequate thermal stability at elevated temperatures, thereby precluding formation of harmful carbonaceous and/or ash deposits.

    Control of Contaminants

    The piston and compression rings must ride on a film of oil to minimize wear and prevent cylinder seizure. At normal rates of consumption, oil reaches a temperature zone at the upper part of the piston where rapid oxidation and carbonization can occur. In addition, as oil circulates through the engine, it is continuously contaminated by soot, acids, and water originating from combustion. Until they are exhausted, detergent and dispersant additives aid in keeping sludge and varnish from depositing on engine parts. But such additives in excessive quantities can result in detrimental ash deposits. If abnormal ash deposits form on the exhaust valve seats, early engine failure may result. Oil that is carried up the cylinder liner wall is normally consumed during engine operation. The oil and additives leave carbonaceous and/or ash deposits when subjected to the elevated temperatures of the combustion chamber. The amount of deposits is influenced by the composition, additive content, engine temperature, and oil consumption rate.

    Oil Quality

    Oil quality is the responsibility of the oil supplier. (The term "oil supplier" is applicable to refiners, blenders, and re branders of petroleum products). Oil quality can also be affected by handling cleanliness, contamination, dirt, water, etc.

    Lubricant Recommendation for Detroit Diesel® Two-Cycle Engines

    Ash Rate


    Updated 08/30/06
    Chevron Delo 100           40 WT              = 0.76    (24% BELOW benchmark)

    Exxon XD-3                     40 WT              = 0.80

    Citgo Mystik Premium     (Citgo is owned by Venezuela)
    Fleet Engine Oil              40 WT              = 0.90     CLICK here for History of Citgo

    Shell Rotella 40T            40 WT              = 1.00    (Shell Rotella 40T is borderline)

    Delo 400                          40 WT              = 1.35    (35% OUT of TOLERANCE)

    This is the only engine oil recommended for Detroit Diesel® two-cycle engines. Lubricants meeting these criteria have provided maximum engine life when used in conjunction with recommended oil drain and filter maintenance schedules. (For additional oil selection criteria, see publication 7SE270.) The API category CD-II (CF-2)(Note: CD-II is an obsolete designation replaced by the current API Rating CF-2) is relatively new and may not be fully in use at the time of this publication. (NOTE: This publication was published in 1989) API category CD may be used provided the recommended military specification is satisfied. Oils with API designation "CE" are not recommended in DDC two-cycle engines unless accompanied by CD-II (CF-2) (Note: CD-II is an obsolete designation replaced by the current API Rating CF-2)

    Single Grade-High Ash Content Lube Oils

    High ash oils (greater than 1,000 mass % ASTM D-874) tend to form excessive deposits on engine parts, resulting in impairment of their function (exhaust valve closure, for example). These are NOT recommended, except where the continuous use of high sulfur content diesel fuels (greater than 0.5 mass %) is unavoidable and where a high TBN, LOW ASH oil is not available.

    Multi-Vis Oils

    Less than optimum engine life must be expected when using 15w-40 oils. Multi-vis oils tend to break down due to mechanical and thermal stress which results in a loss of viscosity and premature engine wear. Multi-vis oils do help cranking when temperatures are below 32 degrees F (0 degrees C). However, once the engine starts, the major advantage of the multi-vis oils is exhausted. When the engine reaches operating temperature, the internal engine temperatures and pressures vary little from an engine operating in much warmer climates. This is when the 2 cycle engine benefits from the superior protection of a 40 wt.

    Starting aids such as automatic ether systems and /or on-board auxiliary heaters provide more reliable starting without sacrificing engine life.

    Engine Parts Can Tell The Difference in Oils

    The following oil performance parameters should be compared:

    Shown are several component comparisons taken after a lube oil performance test.

    Piston and Liner Piston Liner
    Click on image for enlarged photo

    Special Bulletin!
    Scarcity of Availability
    Straight 40 WT. Oils
    Information is now posted in at TEJAS OIL.

    Instructions where to find Locations with MAP & PHONE links.

    A word of Caution

    There are hundreds of commercial crankcase oils marketed today. Obviously, engine manufacturers or users cannot completely evaluate the numerous commercial oils. The selection of a suitable lubricant in consultation with a reliable oil supplier and observance of his oil drain recommendations (based on used oil samples analysis and experience), and provide filter maintenance, will provide the best assurance of satisfactory oil performance.

    It should be noted that lube oil manufactures may reformulate and oil while maintaining the American Petroleum Institute classification, or may reformulate to a new API classification and continue the brand name designation. For example, SE oils being reformulated to SF letter code classification may perform differently after this reformulation. A close working relationship with the lube oil manufacturer should be maintained so that any reformulation can be reviewed and a decision made as to its effect on continued satisfactory performance.

    Detroit Diesel® Used Lube Oil Analysis Program

    The Detroit Diesel® lube oil analysis program is recommended for monitoring the condition of the crankcase oil in all engines.

    Primarily, used lube oil analyses indicate the condition of the oil but not necessarily the condition of the engine. Never tear down an engine based solely on the analysis results obtained from a single used oil sample. However, the condition of the engine should be investigated using conventional mechanical and/or electronic diagnostic instruments. Frequently, visual inspections are all that is required to detect problem areas related to engine wear. It is also prudent to obtain another oil sample from the suspected distressed unit for analysis.

    Abnormal concentrations of some contaminants such as diesel fuel, coolant, road salt, or airborne dirt cannot be tolerated for prolonged periods. Their presence will be reflected in accelerated engine wear, which can result in less than optimum engine life. The oil should be changed immediately if any contamination is present in concentrations exceeding the warning limits.

    6SA314 8901

    To view the API complete listing of oils that meet the classification of 40 wt. and CF-2 click on the following link:
    API Oil Classification

    Special Bulletin!
    Scarcity of Availability
    Straight 40 WT. Oils
    Information is now posted in at TEJAS OIL.

    Instructions where to find Locations with MAP & PHONE links.

    Helpful Tips & Oil Information DDC OIL TEJAS OIL TIRES ELECTRIC Back To Top
    eagle bus. coach. rv. buses. entertainer coaches. recreation vehicles. bus conversions. bus for sale. motor coach. motorcoach. buses for sale. entertainer coach. recreation vehicle. custom coach. eagle bus. bus shells. motor home conversionsTejas Coach Works      
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