A row of big-rog trucks

We serve the trucking industry

Dennis Oil Company, family-owned since 1940, is a large manufacturer/wholesaler of trucking lubricants and transportation supplies. We offer a comprehensive line of heavy-duty engine oils, transmission fluids, greases, and other products to support the trucking industry.

Trucking & Distribution Products

Heavy-Duty Engine Oils

High-performance engine oils including premium multi-grade CK-4 Plus for heavy-duty trucks, semi-synthetic, fully synthetic, and heavy-duty low-ash for natural gas.

Transmission Fluids

Multi-purpose transmissions and transdraulic fluids for heavy-duty trucks, passenger cars, and tractors.


High-temperature, extreme pressure, food-grade, open-gear and semi-fluid, universal, moly, high-shock & load, sprayable, and roller lube.

Oil and Fuel Additives

Premium diesel-fuel improvers, gasoline-fuel additives, as well as oil additives and friction reducers.


Heavy-duty extended life, oat, noat, green anti-freeze, and universal gold options are available.

Hydraulic Oils

Hydraulic oils to handle any hydraulic system, R &O, anti-wear, J20-C, and CAT applications.


Specialty hand, degreasers, asphalt cleaners, and industrial-strength cleaners for a variety of applications.

Power Steering Fluids & Other Industrial Oils

Power steering fluids, specialty and multi-purpose turbine oil, oven-chain lubricants, premium food-grade, form oil, heat-transfer oils, and rock drill oils.

Other products

  • Gear Lubricants
  • Automotive Oils
  • Compressor Oils
  • Bar and Chain Oils
  • Food Grade Lubricants

We understand trucking

We understand the needs of the trucking industry. As a regional distributor, we’ve been in the trucking business for more than 80 years.

We maintain our own fleet of trucks, so we know how important it is to have the right products, at the right time, at a fair price. We’ve seen firsthand how the right lubricants and fluids keep lines of distribution flowing, day after day, with less wear and tear or downtime. Running out of trucking lubricants and oils unexpectedly could shut your operation down, which costs you money. We solve that problem before it happens, by managing your supply inventory. We can keep your tanks full, so you can keep driving.

We also deliver 80-plus years of product knowledge and experience, so you get the best product for the job.

Premium trucking lubricants and oils keep your fleet moving

See why truck lines have trusted Dennis Oil Company for more than 80 years!

  • Reliable product sourcing: Since we manufacture many of our products in-house, we are more protected from supply and demand issues that hit the market.
  • Effortless inventory: We can manage your inventory for you, so your tanks are always full.
  • High-quality products: We offer products that meet or exceed industry standards – backed by third-party laboratory testing.
  • Quick delivery: With four locations, we can get products to your shop quickly.

We Deliver Real Customer Service

Call us today

  • A real person will answer your phone call.
  • Our salespeople will meet you in person at your location.
  • Our delivery drivers will come to your door.

With four locations in Missouri, we travel as far as Kansas, Oklahoma, and Arkansas.