Master Diesel Mechanic
About the job
- A diesel engine certification is required.
- Candidates must be at least 21 years old.
- Ability to rebuild engines.
- Air conditioning, brake, and Department of Transportation annual inspector certifications are required.
- At least 10 years of experience is required.
- Candidates must provide their own tools.
- Ability to work day or night shifts with a flexible schedule.
- Candidates must pass a drug test.
- Ability to speak, write, read, and understand English.
- Determine vehicle condition by conducting inspections and diagnostic tests and identifying worn and damaged parts.
- Keep equipment available for use by completing preventive maintenance schedules, installing component and part upgrades, controlling corrosion, and completing winterization procedures.
- Correct vehicle deficiencies by removing, repairing, adjusting, overhauling, assembling, disassembling, and replacing major assemblies, sub-assemblies, components, parts, or systems, including power and drivetrains, electrical systems, air conditioning, fuel, emissions, brakes, steering, and hydraulics.
- Complete machine shop operations and make adjustments and alignments involving bearing loads, gear tooth contact, valve mechanisms, governors, oil systems, control linkages, clutches, and traction units.
- Verify vehicle performance by conducting test drives and adjusting controls and systems.
- Comply with federal and state vehicle requirements by testing engine, safety, and combustion control standards.
- Maintain vehicle records by annotating services and repairs.
- Contain costs by using warranties and evaluating service and parts options.
- Keep supplies ready by inventorying stock, placing orders, and verifying receipt.
- Perform annual Department of Transportation inspections.
- A safe driving history is preferred.
About the company
Rolfson Oil provides fueling solutions and lubricant logistics for the oilfield, focusing exclusively on the oil and gas sector. It supplies diesel and related lubricants and offers onsite fuel management to keep oil wells and frac fleets fueled. It differentiates itself with proprietary BATBOX onsite dual-fueling systems that run engines on diesel and field gas, plus on-site gas processing to monetize flare gas and reduce emissions. Its goal is to grow into a larger integrated energy company across major shale basins, expanding capacity and pursuing acquisitions while expanding natural gas–related offerings.
Company Size
201-500
Company Stage
N/A
Total Funding
N/A
Headquarters
Addison, Texas
Founded
1985
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Simplify's Take
What believers are saying
- Trive’s February 2026 backing funds expansion and strategic acquisitions.
- Pioneer’s June 2026 deployment validates Tri-Fueling demand from cost-conscious operators.
- Rolfson’s website claims 20 million gallons monthly, 200 trucks, and 4,000 tanks.
What critics are saying
- Rolfson remains tied to Permian and Bakken drilling activity, exposing 2026 volumes.
- June 2026 Pioneer hardware shows Tri-Fueling depends on partners, slowing rollout and margins.
- Any major spill, gas-conditioning failure, or frac customer insourcing could cripple the model.
What makes Rolfson Oil unique
- Rolfson serves only oilfield customers, prioritizing frac fleets over general fuel buyers.
- Tri-Fueling and BATBOX condition field gas onsite, lowering diesel dependency and emissions.
- Trive’s February 2026 investment and Flint acquisition expanded scale across Southwest basins.
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Benefits
Health Insurance
Dental Insurance
Vision Insurance
Life Insurance
Disability Insurance
401(k) Retirement Plan
401(k) Company Match
Flexible Work Hours
Growth & Insights and Company News
6 month growth
0%1 year growth
0%2 year growth
0%Pioneer Energy is supplying field gas conditioning equipment to support Rolfson Oil's Tri-Fueling approach for hydraulic fracturing operations. The equipment includes mechanical refrigeration units and auxiliary skids that remove water and heavy hydrocarbons from field gas to provide consistent fuel. Rolfson Oil, described as the largest provider of frac fueling services in the US, uses Pioneer's technology as part of its Tri-Fueling system, which distributes conditioned field gas to dual fuel and natural gas powered equipment. The approach aims to reduce frac fuel costs and improve operational efficiency. Pioneer Energy's Vice President Joseph Palaia said increased field gas utilisation presents an immediate pathway to reduce costs. Both companies believe field gas utilisation represents an important evolution in frac fleet fueling as operators prioritise cost reduction and emissions performance.
Trive capital invests in Rolfson oil. Subsequent to Trive's investment, Rolfson acquired Flint Logistics Group, an Oklahoma City-based provider of fuel, oils, and lubricants. 32 minutes ago