Optimum Diesel
Auto Repair StationsTennesseeGreene CountyGreenevilleOld Stage Road
Greene County . Tennessee
Close Now
- Overview
- Intro
- Photos
- Location
- Reviews
- +1 423-329-0029
- 1180 Old Stage Rd, Greeneville, TN 37745, USA
Operating Hours
Optimum Diesel Introduce
Optimum Diesel operates within the "Auto Repair Stations" category, but with a highly specialized focus: the comprehensive repair, maintenance, and performance optimization of diesel engines. Unlike general auto repair shops that cater to a wide range of gasoline and diesel vehicles, Optimum Diesel dedicates its expertise exclusively to diesel powertrains. This specialization makes it a critical resource for owners of diesel cars, light trucks, heavy-duty trucks, fleet vehicles, and potentially even industrial or agricultural diesel equipment, seeking in-depth knowledge and advanced solutions for their specific engine needs.
The environment at Optimum Diesel is purpose-built for servicing diesel vehicles, which often require different equipment and a more robust setup than gasoline engines. You can expect a professional, industrial-grade facility. The service bays are typically spacious and well-equipped to accommodate larger vehicles, including heavy-duty trucks if that is part of their service scope. These bays house specialized diagnostic tools, heavy-duty lifts, and equipment specifically designed for diesel fuel systems, turbochargers, emissions systems (like DPF and DEF), and engine overhauls. The facility will likely maintain a high level of cleanliness and organization, indicative of the precision required for complex diesel engine work. The waiting area for customers, while perhaps more utilitarian than a typical passenger car repair shop, will still aim to be comfortable and functional, often providing a space for drivers to handle paperwork or rest. The overall atmosphere emphasizes expertise, capability, and a deep understanding of diesel technology, designed to instill confidence in owners of these specialized vehicles.
Optimum Diesel offers a wide array of services, meticulously tailored for diesel engines. Their comprehensive offerings typically include:
Advanced Diesel Diagnostics: This is a cornerstone service. Utilizing specialized diagnostic software and equipment, they pinpoint complex issues unique to diesel engines, such as fuel injection problems, turbocharger malfunctions, emissions system faults (e.g., DPF regeneration issues, DEF system failures), and intricate electronic control module (ECM) errors. They often conduct comprehensive troubleshooting to identify the root cause of performance concerns or dashboard warning lights.
Fuel System Repair & Service: This is crucial for diesel engines. Services include repair, calibration, and replacement of high-pressure fuel pumps, fuel injectors (including common rail and HEUI systems), fuel filters, and fuel lines to ensure optimal fuel delivery and combustion. They may also address fuel contamination issues.
Turbocharger Service & Repair: Diesel engines heavily rely on turbochargers for power. Optimum Diesel diagnoses and repairs issues like boost leaks, turbine damage, wastegate malfunctions, and performs turbocharger replacements or upgrades for performance.
Emissions System (DPF/DEF/EGR) Maintenance & Repair: With stringent emissions regulations, these systems are vital. Services include Diesel Particulate Filter (DPF) cleaning or replacement, Diesel Exhaust Fluid (DEF) system diagnostics and repair, and Exhaust Gas Recirculation (EGR) valve cleaning and replacement to ensure compliance and optimal engine performance.
Engine Overhauls & Rebuilds: For extensive engine issues, Optimum Diesel is equipped to perform partial or complete engine overhauls and rebuilds, restoring diesel engines to optimal performance and extending their lifespan.
Routine Diesel Maintenance: This includes specialized oil changes using high-quality lubricants designed for diesel engines, fuel filter replacements, air filter checks, and other preventative maintenance specific to diesel vehicles.
Glow Plug System Service: Essential for cold starting diesel engines, they diagnose and replace faulty glow plugs or glow plug control modules.
Cooling System Service: Maintenance and repair of radiators, water pumps, thermostats, and coolant flushes, vital for managing the higher operating temperatures of diesel engines.
Transmission & Drivetrain Service: While specializing in engines, many diesel shops also offer services for transmissions (especially heavy-duty automatic and manual transmissions) and drivetrain components.
Performance Upgrades & Tuning: For customers seeking increased power, torque, or fuel efficiency, Optimum Diesel may offer performance modifications, including custom tuning (ECM remapping), aftermarket turbocharger installations, or exhaust system upgrades (e.g., DPF-back exhausts).
Fleet Services: Many specialized diesel repair shops cater to commercial fleets, offering tailored maintenance schedules, priority service, and discounted rates to keep businesses' vehicles on the road.
Several key features distinguish Optimum Diesel and make it a preferred choice for diesel vehicle owners. Firstly, their specialized expertise is paramount. Unlike general mechanics, the technicians at Optimum Diesel possess in-depth knowledge and often specific certifications (e.g., ASE Diesel certification, manufacturer-specific training) in diesel engine technology, which is crucial given the complexity of these powertrains. Secondly, the use of advanced, dedicated diagnostic equipment is a significant feature. Generic scan tools often fall short for modern diesel engines, making specialized software and hardware essential for accurate troubleshooting. Thirdly, a commitment to using quality, often OEM or OE-equivalent parts ensures that repairs are durable and maintain the integrity of the vehicle. Fourthly, their potential to offer performance tuning and upgrades caters to a segment of diesel owners who seek to enhance their vehicle's capabilities beyond stock specifications. Lastly, many highly specialized shops like Optimum Diesel prioritize transparent communication, providing detailed explanations of issues and repair processes, along with clear estimates, to ensure customer understanding and trust. Some may also offer roadside assistance for disabled diesel vehicles, especially for fleet customers.
Regarding promotional information, Optimum Diesel's strategies will likely be targeted towards their niche market. While specific, real-time offers are best confirmed directly with the shop, common types of promotions and value propositions observed in the diesel repair sector include:
Diagnostic Specials: Offering discounted or complimentary diagnostic checks for diesel engines, especially when a "check engine" light is on, to attract customers and identify necessary repairs.
Seasonal Diesel Maintenance Packages: Promotions tailored for specific seasons, such as "Winter Diesel Prep" (including fuel additive treatment, battery check, glow plug inspection) or "Summer Performance Checks."
Fleet Service Discounts & Preferred Pricing: For businesses with multiple diesel vehicles, offering volume discounts on maintenance and repairs, or setting up preferred service agreements.
Fuel System Cleaning Specials: Discounts on services like injector cleaning or fuel system flushes, crucial for maintaining diesel engine health.
DPF Cleaning/Regeneration Offers: Given the cost of DPF replacement, promotions on DPF cleaning services can be highly appealing.
Performance Tuning Packages: Special pricing on engine tuning or performance upgrade kits for those looking to boost power or fuel economy.
Loyalty Programs: For repeat customers, offering a loyalty program that provides discounts on future services or parts.
Warranty on Repairs: Highlighting a strong warranty on parts and labor for diesel repairs provides significant peace of mind to customers.
In conclusion, Optimum Diesel stands as a premier "Auto Repair Station" for owners of diesel-powered vehicles. Their specialized environment, extensive service offerings, and commitment to expert diagnosis, repair, and performance enhancement make them an indispensable resource for ensuring the longevity, reliability, and optimal performance of diesel engines, from daily drivers to heavy-duty commercial trucks.
Optimum Diesel Location
Optimum Diesel Customer Reviews
From Bert Cleaves..Absolutely very satisfied with Gene and his crew..Very honest..good and fair prices..They know what they are doing..Very satisfied and highly recommend..I’ve always taken my diesel to them, always will..They get the job done…Highly recommend.
Sep 25, 2024 · Starr Cleaves
Gene. Went above and beyond to help me and my family out. We were out of town and stranded. Everybody was saying 2 weeks to fix. Gene and his guys. Stopped what they were doing to help us out. I just can't say enough good things about the company. Have no doubt. He will treat u fair and have your best interest at heart. The o ly thing I would say. ... I wish they were local in alabama. As he would have all my business's. Thanks for everything Gene!!
Aug 24, 2022 · Marcus Wright
Simple, Fair, and Honest! Gene is the ONLY person I will let work on my trucks. Have dealt with other shops that said “ well maybe it’s this or that, we’re not sure”. Gene just fixes them, no matter what the problem is. He also lets you know about or just goes ahead and fixes other things that are on the way to breaking down. There are always 40 trucks in the lot waiting to be worked on, so that says something in itself. Fact is, if you want it fixed right, just take it to him. Also, if the man doesn’t answer the phone, he’s probably working on a truck so get over it.
Sep 08, 2022 · Michael Ward
Can't really speak to how good this shop is because I called them 4 different times in the last 2 weeks, left messages and never received a call back!!! I can only assume that they are no longer in business. Update: After the above review was posted, the owner of the shop reached out to me and was extremely upset over my 1 star rating. He appolgized for not returning my calls and said that he is extremely busy, to the point of a 2 month back log, and that he receives hundreds of calls a day. Since my previous 1 star rating (avoid) was based on my assumption that the business was closed, I am revising my rating with this update. And to clarify - I am not, or have never been, a customer of Optimum Diesel. My rating is based solely on the fact that my calls for help went unanswered, and that any business big or small that does not return phone calls from potential customers will not receive even an average rating!!!
Aug 29, 2022 · Roc Hess
Best diesel guys in the business. Gene and his team have kept my truck going allowing me to keep my business going. I have used other shops in the past with nothing but disappointment and broken promises. Save yourself heartaches and headaches and use these guys.
Jan 30, 2021 · jeff manuel
More Auto Repair Stations Near Me

Kiser Blvd. Auto Repair
1381 Kiser Blvd, Greeneville, TN 37745, USA
(202)
Close Now

CBC Truck & Trailer Repair
1622 Industrial Rd, Greeneville, TN 37745, USA
(9)
Close Now

DPF Alternatives Of East Tennessee LLC
1135 Kiser Blvd, Greeneville, TN 37745, USA
(3)
Close Now

Performance Automotive Machine
1536 Industrial Rd, Greeneville, TN 37745, USA
(41)
Close Now

Advance Auto Parts
1290 E Andrew Johnson Hwy, Greeneville, TN 37745, USA
(377)
Close Now

A1 Towing & Recovery of Greeneville - Light Duty & Heavy Duty Semi Truck Towing
1025 Kingsport Hwy, Greeneville, TN 37745, USA
(328)
Close Now

Recommended
salvage yards riverside ca
(607)
+1 800-962-22773760 Pyrite St, Riverside, CA 92509, USA
clean energy fuel station
8 Grand Blvd, Brentwood, NY 11717, USA
george's fontana
(242)
+1 909-822-34029684 Sierra Ave., Fontana, CA 92335, USA
smog check in san fernando ca
(48)
+1 661-944-290037855 90th St E #B, Littlerock, CA 93543, USA
autozone auto parts aberdeen car parts
(906)
+1 818-485-052113200 Osborne St, Arleta, CA 91331, USA
empire mazda service & parts
(142)
+1 631-479-3874660 E Jericho Turnpike, Huntington Station, NY 11746, USA
Related Categories
Popular

Best Tow Trucks for Large Vehicles: Top Picks for Heavy-Duty Towing Needs
May 15, 2025
How to Handle a Car Accident in a Parking Garage: A Comprehensive Guide
May 15, 2025
Essential Guide to Motorhome Towing Assistance: Expert Help When You Need It
May 15, 2025
What to Do If Your Car Is Involved in an Accident with an Animal
May 15, 2025
Local Towing Service for Big Trucks: Expert Help When You Need It Most
May 15, 2025
Reliable Towing Services for SUVs: Essential Tips for Safe and Efficient Towing
May 15, 2025
How to Replace a Car's Ignition Control Module: Step-by-Step Guide
May 15, 2025