construction site with diggers and a dump truck

We serve the heavy-construction industry

Dennis Oil Company, family-owned since 1940, is a large manufacturer/wholesaler of lubricants and oils for the heavy construction industry. We offer a comprehensive line of heavy-duty engine oils, hydraulic fluids, and other products used by heavy construction crews.

Heavy Construction 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.

Hydraulic Oils

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

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.


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
  • Anti-Freeze
  • Compressor Oils
  • Bar and Chain Oils
  • Food Grade Lubricants

Quality heavy construction lubricants and oils

Dennis Oil Company helps your construction crew meet important deadlines.

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

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.