24-Hour dedicated refueling and delivery service

Diamond Oil Service is your reliable source for the best in refueling and delivery services. Since 1995, we've provided exceptional service and petroleum products to Southern California.

No job is too small or large for us. We provide same-day service and can meet your fueling needs on time and within budget. We offer a 24-hour service for emergency response calls and priority situations. Immediate e-mail billing upon completion of service is also available. Our vehicles come equipped with Teletrac for advanced fleet management, real-time location for ETA ís and accurate delivery notifications.

Valvoline Commercial and Industrial Lubricants

Vavoline Lubricants

Diamond Oil is a proud distributor of Valvoline Commercial and Industrial Lubricants. From heavy duty disel engine oil to premium greases, we cover it all. Valvoline Premium Blue 15w40 is endorsed by Cummins for extended drain, please contact us for more information.

  • Premium Blue 15w40 - Cummins Endorsed
  • Premium Blue 5w40 Full Synthetic
  • Eaton Hydraulic Oils
  • Unitrac Hydraulic Tractor Fluid
  • All Fleet Heavy Duty Engine Oils
  • Cerulean Lithium Complex Grease
  • Maxlife ATF
  • Drive Train 10, 30, and 50
  • High Performance Gear Oil 80w-90 and 85w-140
  • R&O Turbine Oil
  • Drill Lubes
  • Gear Oils

Protect our resources go green use Bio Fuels


Our commitment to excellence in all our endeavors helps us generate the best possible service to our customers. So whether you need fuel for backup generators, your next function, event or emergency, go no further than Diamond Oil Service.

We are proud to provide service to all counties in the Southern California area.

Products and Services

Diamond Oil Service offers a wide array of products and services to meet your needs and concerns. We provide fueling services for the following:

  • Equipment rental companies
  • Emergency backup for office buildings
  • Studio and events (including division 5 fuel permits)
  • TV and radio stations
  • Cell sites (off road locales)
  • Wet hosing for trucking companies
  • Refrigerated trailer companies
  • Local government
  • Bus companies
  • Construction sites
  • Hospitals