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Finding the Right Engine Oil for the Job


Engine oils that support business growth

For more than 90 years, Mobil Delvac has been a trusted lubrication collaborator for many of the world's most successful fleets, providing:


that comes with extreme-temperature performance and outstanding engine protection.

Efficiency and cost savings

from improved fuel economy potential and extended oil drain interval capability.                      

Delvac Days have been extended

Get up to $2 off per gallon on some of our most popular Delvac products

Chosen by many of the world's leading heavy-duty equipment manufacturers

Boosting uptime

Mobil Delvac 1 ESP 0W-40, 5W-40 & ADVANCED FUEL ECONOMY

Advanced full synthetic oils that demonstrate:

  • Extended oil drain interval (ODI) potential up to 3X the average OEM ODI recommendation
  • Long engine life and reliable operation in a wide range of applications
  • Emission system protection

Mobil Delvac Extreme 10W-30 & 15W-40

Synthetic oils that deliver:

  • Extended ODI potential up to 2X the average OEM ODI recommendation
  • Up to 46% more antioxidant and 44% more anti-wear additives than Mobil Delvac 1300 Super
  • Exceptional oxidation stability

Mobil Delvac 1300 SUPER 10W-30 & 15W-40

Synthetic blend oils that provide:

  • Extended ODI potential up to 1.5X the average OEM ODI recommendations
  • Stay-in-grade shear stability and excellent low-temperature pumpability
  • Excellent soot and viscosity control

Mobiltrans AST Series

  • All-season lubrication for all drivetrain components 
  • Helps deliver extended drain and service intervals
  • Formulated for long clutch and wet brake life; meets Cat TO-4M specification

Mobil DTE 10 Excel Series

  • Outstanding wear protection and system cleanliness
  • Excellent oxidation and thermal stability
  • Energy efficiency potential to reduce fuel expenses 

Reducing Maintenance

Mobiltrans HD Series

  • Viscosity grades for hydraulic, transmission, and drivetrain applications
  • Formulated for long clutch and wet brake life; meets Cat TO-4 specification 
  • Excellent gear and bearing protection

Mobil Hydraulic 10W

  • Excellent performance in a wide range of hydraulic systems
  • Protection against oil thickening, high-temperature deposits, varnish, and oil degradation
  • Good performance at higher temperatures and extended operating intervals

Mobil Centaur XHP Mine Series

  • Excellent extreme-pressure protection and load-carrying ability for equipment protection under heavy and shock loading
  • Excellent high-temperature oil bleed control
  • Advanced polymer additive package resists water washout

Mobil Centaur Moly Grease

  • Excellent extreme-pressure protection and load-carrying ability
  • Enables extreme-pressure performance retention and protection in severe sliding situations
  • Provides exceptional water resistance and corrosion protection

Mobilfluid 424

  • Exceptional performance in powertrain transmissions, drive axles, clutches, power take-offs (PTOs), and hydraulic systems
  • Enhanced frictional properties help reduce chatter in wet brake and PTO service
  • Multipurpose capability provides opportunity for lubricant consolidation

Where Problems meet solvers

Discover what STERN can do for you.

Oil insights: More Uptime Than You May Think

This program is focused on helping fleets get the uptime they aspire to by giving them the condition monitoring and insights they need to prevent unplanned downtime.


Stern Company Announces CFO Leadership Appointment

Dan Rausch will be appointed Chief Financial and Strategy Officer, effective immediately.

STERN Updates

Redefine Success with the Complex Line of Mobil Oils

Synthetic motor oils represent nearly 20 percent of the market – and that percentage is growing rapidly. 


Understanding Grease Compatibility and Conversion

Grease compatibility is not necessarily an indication on whether a conversion can be done; it’s often a tool to identify how it should be done.


Five Tips to Recruit and Retain Diesel Technician Talent

It’s no secret. Successful fleets have great diesel technicians. Industry expert George Arrants shares five tips on finding and retaining top talent.

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