Services
Our Diesel mechanic Services
With 5 service bays and a highly-trained diesel mechanic team, Stanley & Sons Services
take on a wide range of repair and maintenance services. From DOT inspections and preventive maintenance services, to repairs on budget & aerial lift trucks, trailers & heavy equipment, trust our diesel mechanic team to get your vehicles and equipment back to fine working condition.
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Our Diesel mechanic Services
Located in Middletown, Connecticut, we cater to a wide range of vehicles, including fleets, light, medium, and heavy-duty trucks, buses, and heavy equipment. Our ASE certified technicians have the experience and expertise to get your vehicle back on the road safely. For professional truck repair and fleet services in Middletown, get in touch with Stanley & Sons Services today!
★★★★★
Great guys, great work, great competitive pricing. It's nice to see a small business built from the ground up proving what a real passion for the work they do and customers they service. One of the few shops that is actually good with diesels if you're looking to get your truck or equipment repaired and repaired correctly look no further this is the place.
★★★★★
I've been looking for someone for the passed 30 years and I finally them. The work I had done was very professional and kept me up to date on my vehicles, ie would it cost me more or they found something we were not aware of. I'm also ready to leave my 3rd vehicle service which will need ,check engine light,front end work,exhaust system and so on. Very reasonable labor rate I recommend all my family and friends.
★★★★★
The owner was very nice and professional. He is an incredible mechanic and gets the work done correctly every time. This is the only place I’ll ever go to get ANY sort of service on any of my vehicles. Not to mention he works on Foreign vehicles as well! Overall great environment, amazing owner, incredible quality work.
★★★★★
For ANY of your vehicle's needs, see Jason @ Stanley & Sons. He skillfully rebuilt my Entire-Cooling-System Mid-Summer, on a tight-budget, during-a-Pandemic!
Contact Us
Choose Stanley & Sons Services
for your diesel truck needs. Contact us today to schedule diesel services and experience the reliability and performance that your truck deserves. Your satisfaction is our priority, and we're here to keep your trucks running smoothly.
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Request Service
Simply fill out our online service request form, and we will get back to you as soon as possible to schedule an appointment.
Frequently Asked Questions
What should I bring or prepare before dropping off my truck?
Bring recent service records, fault codes or error messages, and a clear description of when and how the problem occurs. Note fuel type, recent repairs, and any aftermarket devices (towers, telematics). Remove personal items from the cab; secure valuable tools. If the truck is used for a route, give preferred drop-off/pick-up windows. This saves diagnostic time, reduces back-and-forth, and helps us replicate the issue faster for an accurate estimate.
How do you estimate repair time and minimize downtime for owners and fleets?
We issue a time-to-repair estimate based on diagnosis, parts availability, and permit needs. For fleets, we prioritize quick triage and offer staged repairs—address safety-critical items first, then schedule performance work. We keep a parts-stock plan for common models and maintain relationships with local suppliers for rush orders. Communication is constant: we update ETAs, alternatives (loaner, mobile repair), and any schedule changes to reduce route disruption and lost revenue.
What warranties cover parts and labor — and what’s not included?
We warranty our workmanship (typically 12 months) and pass through manufacturer warranties on parts. Warranties exclude damage from misuse, lack of maintenance, or aftermarket modifications. For electronic modules and sensors we follow manufacturer terms—some require dealer-level programming to preserve the warranty. Warranty claims require inspection to confirm the failure mode, and we’ll coordinate with suppliers to expedite replacements when valid.
How do you handle electrical and computerized diagnostics on modern trucks?
Modern trucks require CAN-bus scanning, live-data capture, and calibration after part replacement. We use up-to-date diagnostic tools to read manufacturer codes, monitor live parameters, and run system tests. When updates or reflashes are needed, we verify software versions and document any required dealer-level programming. We also check for root causes—corroded connectors, poor grounds, or intermittent wiring—that commonly trigger repeated fault codes.
What routine maintenance prevents expensive failures for heavy trucks?
Key preventative tasks: regular fluid analysis (oil, coolant), scheduled transmission and differential services, brake inspections and adjustments, suspension & steering checks, and fuel/water separator maintenance. We emphasize replacing consumables at manufacturer intervals and using oil analysis for high-utilization trucks to detect internal wear early. Consistent PM saves downtime, improves fuel economy, and extends component life—especially critical in stop-and-go local work around Middletown.
How do you help with DOT compliance and inspection readiness?
We pre-inspect for common DOT failure points: brakes, lights, tires, steering, and secure mounting of safety equipment. We document repairs with photos and receipts, provide inspection-ready checklists, and can perform pre-trip or annual inspections to catch issues before an official exam. For fleets, we keep compliance histories to simplify audits. Prompt corrective action reduces fines, out-of-service time, and keeps your drivers earning.
Can you provide mobile service or on-road repairs?
Yes — we offer mobile diagnostics and light-repair capabilities for roadside failures (battery, starter, minor electrical, tire changes). For heavy repairs we provide towing or arrange mobile stabilization until the truck reaches our shop. Mobile service reduces route interruption and is ideal when immediate towing isn’t practical. We triage on-site, quote repair vs. tow options, and advise whether temporary fixes are safe for short trips.
How do you price labor and why do rates vary between shops?
Labor rates reflect technician skill, tool investment, and shop overhead. Complex diagnostics and electronic calibrations require specialized equipment and training—those jobs cost more than routine oil changes. We provide time-based labor estimates and explain when a job is quoted as flat-rate vs. hourly. We aim for transparent pricing and will justify hours, show labor breakdowns, and offer alternatives if you prefer staged repairs to spread costs.
How fast can you source hard-to-find or back-ordered parts?
We maintain relationships with local and national suppliers and can often source common parts quickly. For specialty items we provide lead-time estimates and suggest temporary repairs or used parts to keep trucks running. If a part is back-ordered, we offer interim solutions (loaner modules, rebuilt components) and prioritize arrivals with expedited shipping when the economics make sense. Communication about timing is constant so you can plan routes.
What preventative tips can drivers follow daily to reduce shop visits?
Daily checks save hours: inspect tires for cuts and proper pressure, check fluid levels (oil, coolant, windshield), listen for unusual noises, confirm brake response, and scan dash for warning lights. Clean battery terminals and visually inspect wiring bundles for chafing. Encourage drivers to record small anomalies—the earlier we see trends, the less likely a breakdown. A disciplined pre-trip routine is the cheapest and most effective way to extend uptime and reduce repair costs.



















