
- Comprehensive oil analysis detects early signs of wear
- Fast turnaround times for quick decision-making
- Customized testing protocols for your specific equipment needs
- Expert recommendations to optimize maintenance

Trusted Engine Oil Analysis Experts
As a leading fuel and fluid partner serving the Denver metro Denver, Fleet Core brings unparalleled expertise in engine oil testing and analysis. Our in-house laboratory uses the latest diagnostic technology to provide you with comprehensive insights into the health of your equipment. From heavy-duty agricultural machinery to municipal fleet vehicles, we have the know-how to keep your operations running smoothly.
Our team of certified lubrication specialists works closely with you to develop customized oil analysis programs tailored to your unique needs. By monitoring key indicators like viscosity, contaminants, and additive depletion, we’ll help you make data-driven decisions that optimize equipment life and avoid costly breakdowns.
Who We Serve
Keeping Denver’s Engines Running Strong
Whether you’re managing a bustling construction site, tending to acres of farmland, or keeping a city’s services running smoothly, we’ve got your back. Our engine oil testing lab in Denver is equipped to handle the unique challenges of Colorado’s diverse industries.

Fleet and Facilities Management
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Fleet and Facilities Management
Your Challenge
Contaminated oil and liquids disrupt fleet schedules, impact component failures, advance wear and tear, and accelerate maintenance and replacement costs.
Our Solution
Regular oil and lubricant testing maintains clean oil and fluid systems for operational uptime, prevents contamination, extends engine, transmission, and hydraulics life, and lowers vehicle repair costs.

Project and Construction Site Management
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Project and Construction Site Management
Your Challenge
Oil and liquid-related equipment downtime can delay critical projects and timelines.
Our Solution
Prevent issues with tested and certified oil and liquids required for heavy equipment operation—prevent unexpected downtime and disruption and extend equipment life and performance.

Engineering and Operations Management
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Engineering and Operations Management
Your Challenge
Exposure to productivity disruptions, equipment breakdowns, production schedule delays, etc.
Our Solution
Proactive diagnostics yield actionable insights, safer asset management, and data-driven predictive maintenance schedules.

Environmental Compliance Management
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Environmental Compliance Management
Your Challenge
Exposure to penalties for non-compliance due to oil waste and environmental impact.
Our Solution
Our oil analysis pinpoints issues early, helping you extend oil change intervals, protect engine investment, and limit environmental impact risks.
Why Choose Us
Your Equipment Deserves the Best Care

At Fleet Core, we’ve been keeping generators, combines, and semi trucks running in the Denver area for years. Through that time we have built a reputation for reliability that was created, in part, by our ability to prevent and identify costly breakdowns through comprehensive oil testing and analysis.
Early Problem Detection
- Catch wear issues before they become catastrophic failures
- Identify contamination sources quickly
Extended Equipment Life
- Optimize oil change intervals based on actual oil condition
- Reduce unnecessary wear and tear
Cost Savings
- Avoid expensive repairs and unplanned downtime
- Reduce overall maintenance costs
Cost Effective Oil Spill Cleaner
- Concentrated formula provides excellent value per cleanup
- Reduces the need for multiple specialized cleaning products
- Minimizes disposal costs with biodegradable formulation
Trusted by Industry Leaders for Fuel and Lubrication Management

Fuel Delivery
On-Demand Fuel Supply for Uninterrupted Operations
Why worry about running out of fuel when you can have it delivered right to your facility? Our scheduled and emergency fuel delivery keeps your generators, fleet vehicles, and equipment running without costly trips to gas stations or supply disruptions.
Diesel Fuel Testing
Know Your Fuel Quality Before Problems Start
Professional diesel fuel testing identifies contamination levels, water content, and microbial growth before they damage your equipment. Our comprehensive analysis gives you the data needed to make informed decisions about fuel treatment and replacement schedules.


Fuel Polishing
Restore Fuel Quality & Protect Emergency Equipment.
Ensure peak performance of your generators and emergency equipment with professional fuel polishing services. Remove water, sludge, and microbial growth to restore fuel quality and prevent costly downtime.
Fuel Storage Tank Clenaing
Know Your Equipment’s Health Before Problems Strike
Detect early signs of engine wear and contamination with precision oil analysis. Gain insights that help you prevent costly breakdowns and extend the life of your fleet.


Spill Cleanup
Accidents Happen, Eco-Friendly Cleaning Solutions
Ensure peak performance of your generators and emergency equipment with professional fuel polishing services. Remove water, sludge, and microbial growth to restore fuel quality and prevent costly downtime.
Engine Oil Testing & Analysis
Know Your Equipment’s Health Before Problems Strike
Wondering if your generators and backup systems are ready for the next emergency? Our comprehensive engine oil testing reveals hidden problems like contamination, wear metals, and additive depletion before they cause costly breakdowns. This data-driven approach helps Denver facilities maintain peak performance while extending equipment life and avoiding surprise failures.

Testimonials
Our Commitment To Excellence
Fleet Core is more than just a fuel and fluid provider — we are your comprehensive ENERGY PARTNER supporting operational reliability, productivity, and sustainability.

“Great company and great service!! Employees are well trained and very professional!!”

“Fleet Core offers excellent customer service. They complete the commitments they make and take care of their clients.”

“Great Diesel and Service. Extremely low temps and Core Power didn’t let me down. I would recommend Fleet Core and Core Power diesel to anyone in the Denver area.”

“Quick and efficient on-site fuel delivery.”