Delvac 1 Specifications

Mobil Delvac 1
® High-Performance Synthetic, Heavy-Duty Diesel Engine Oil

Mobil Delvac 1 Synthetic high-performance diesel engine oil contains high-quality synthetic base stocks and a unique additive system. It provides outstanding high-temperature detergency and all-temperature dispersancy, with optimized resistance to thermal degradation and oxidation, wear and corrosion.

Mobil Delvac 1 carries an SAE 5W40 viscosity rating. It has all the advantages of an SAE 40 weight oil without the higher oil consumption inherent in multigrade oils that use very light mineral oil base stocks. Because synthetics have higher boiling points than conventional oils, Mobil Delvac 1 does not evaporate as readily in the high-temperature piston ring area of turbocharged diesel engines.

Mobil Delvac 1 has the same viscosity as most SAE 40 oils at the high end of the temperature-viscosity scale. However, because of its higher viscosity index and unique molecular structure, it provides a better protective film at higher temperatures than conventional oils. Mobil Delvac 1 remains fluid at subzero temperatures as low as 54° C (65° F), and provides rapid cold-engine startups and warmups.

Mobil Delvac 1 can provide satisfactory lubrication at temperatures up to 100° above the upper limit for conventional mineral oils. It is fully compatible with conventional heavy-duty diesel and gasoline fleet engines. It also provides unsurpassed protection against soot related viscosity increases in low emission diesel engines.

Mobil Delvac 1 has long drain capability and can be extended in service beyond the builder recommended drain interval in both diesel and gasoline engines. Consult your Mobil representative for specific recommendations.

Mobil Delvac 1 will provide outstanding wear protection and deposit control in the most demanding diesel engines of Cummins, Caterpillar, Mack, Navistar, Detroit Diesel, and others. It is balanced to provide optimum engine life until overhaul, in both high-loaded, thermally stressed diesel engines and units operating at lower speeds in pickup-and-delivery service.

Mobil Delvac 1 exceeds the requirements of:

  • API CG4, CF4, CF, SJ, SH
  • Mack EOM, EOL, EOL Plus, EOK/2
  • Detroit Diesel 7SE 270
  • Caterpillar 10 TBN requirement
  • Caterpillar 1N/1K performance
  • Extended Sequence IIIE, VE, L38
  • 2.0% distillation at 700° F.


Mobil Delvac 1 is recommended for diesel and gasoline-powered fleet vehicles, such as over-the-road, off-the-road, truck rental, pick-up-and delivery, utility, and school bus fleets. It is capable of providing fuel economy benefits of up to 3% and more in heavy-duty diesel engines with as much as a 40% reduction in oil makeup in over-the-road service.

When Mobil Delvac 1 is used in an engine for the first time, no system preparation is necessary other than proper draining and installation of a new filter. In an emergency, conventional oil can be used as makeup for Mobil Delvac 1, but such mixing may lower the performance of Mobil Delvac 1. Do not dilute crankcase oil with gasoline or kerosine in cold weather. The diluent will not improve cold cranking and may have an adverse effect on the performance of Mobil Delvac l.

In addition, Mobil Delvac 1 is recommended for extended drain performance in truck or trailer-mounted refrigeration units.


  • New super high performance in both diesel and gasoline engines
  • Performance surpasses all conventional oils
  • Enhanced TBN wear/cleanliness protection
  • Diesel quality reserve for longer engine life
  • Extended engine life until overhaul in 1998 certified and pre-1998 diesel engines
  • Superior soot control in 1998 certified diesel engines
  • Enhanced protection against bore polishing and engine scuff
  • Unique oil consumption control
  • Extended high-temperature and stop-and-go gasoline performance
  • Wide-temperature-range protection
  • Long drain capability
  • Documented fuel economy


Product Number


SAE Grade


Gravity, API


Pour Point, °C (°F)

-54 (65)

Flash Point, ASTM D 92, °C (°F)

230 (446)

Viscosity cSt at 40° C


cSt at 100° C


SUS at 100° F


SUS at 210° F


Cranking Viscosity, cP at + 25°C


Pumping Viscosity, cP at 35°C


Borderline Pumping Temperature, °C


HT/HTS, cP at 150°C


Viscosity Index


Sulfated Ash, wt %


TBN, ASTM D 2896


Color, ASTM D 1500


Health and Safety

Based on available toxicological information, it has been determined that this product poses no significant health risk when handled and used properly. Information on use and handling, as well as health and safety information, can be found in the Material Safety Data Sheet which can be obtained from either your local distributor, the Internet, or by calling 1-800-662-4525, prompt 2.

For additional technical information contact your Superior Petroleum Account Representative.

Superior Petroleum
865 N Superior Dr. Crown Point, IN 46307
Phone: 800.700.OILS (5457)