LI Diesel Guys

(38 reviews)

Auto Repair StationsNew YorkSuffolk CountyRonkonkoma15th Street

Suffolk County . New York

Close Now

  • Overview
  • Intro
  • Photos
  • Location
  • Reviews

Operating Hours

Monday 7:00 AM - 4:00 PM
Tuesday 7:00 AM - 4:00 PM
Wednesday 7:00 AM - 4:00 PM
Thursday 7:00 AM - 4:00 PM
Friday 7:00 AM - 4:00 PM
Saturday Closed
Sunday Closed

LI Diesel Guys Introduce

LI Diesel Guys, located at 7 15th St, Ronkonkoma, NY 11779, USA, is a highly specialized and acclaimed establishment operating within the "Auto Repair Stations" platform category. While the broad category encompasses general auto repair, LI Diesel Guys distinguishes itself as a premier destination for diesel truck and equipment owners across Long Island. Their focus on diesel vehicles, particularly Ford Super Duty and Powerstroke engines, sets them apart, offering a level of expertise and dedicated service that is often unparalleled by more generalized repair shops. The strong positive customer reviews underscore their reputation for exceptional service and technical prowess.

The environment at LI Diesel Guys is specifically tailored to handle heavy-duty diesel vehicles. As highlighted in customer testimonials, they boast a "large Diesel facility with all the bells and whistles," indicating a substantial and well-equipped workshop. This likely includes multiple large bays capable of accommodating commercial trucks and heavy equipment, specialized lifts, and an extensive array of diagnostic tools and equipment specific to diesel engines. The reviews also praise the "very clean and organized" work area, which speaks volumes about their professionalism and commitment to efficient operations. Such an environment not only facilitates high-quality repairs but also instills confidence in customers, knowing their valuable vehicles are being serviced in a meticulous and professional setting. The shop's location in Ronkonkoma makes it a convenient service point for diesel vehicle owners across Long Island, drawing customers from a wide radius, as evidenced by one reviewer traveling an hour and twenty minutes for their services.

LI Diesel Guys offers a comprehensive range of services, deeply rooted in their specialization in diesel engines, but also extending to gas trucks and equipment. Their core services, as an "Auto Repair Station" focused on diesel, include:

  • Specialized Diesel Engine Repair: This is their forte, particularly for Ford Super Duty trucks and Powerstroke engines. They are known for diagnosing and fixing complex issues that other mechanics might miss, as one customer attested to having an issue resolved in minutes that eluded three other mechanics for months. They offer services ranging from routine maintenance to full body-off engine repairs and overhauls, including 'bulletproofing' 6.0L/6.4L engines for enhanced reliability.
  • Advanced Diagnostics: With "industry-leading diagnostic equipment and software," they can accurately pinpoint issues, which is crucial for modern, electronically controlled diesel engines.
  • Preventative Maintenance: Regular servicing, including oil changes, fluid checks, filter replacements, and general inspections, to ensure optimal performance and longevity of diesel vehicles.
  • NYS Registered Inspection Station: They are authorized to perform Safety, Emissions, Motorcycle, Diesel, and Heavy Truck Inspections, providing a crucial and convenient service for vehicle owners.
  • Fleet Maintenance and Repair: They welcome both small businesses and large fleet accounts, offering prompt and efficient service to minimize downtime for commercial vehicles.
  • Performance Upgrades: For those looking to enhance their vehicle's capabilities, LI Diesel Guys offers aftermarket upgrades, being dealers for reputable brands like KC Turbos, FASS Fuel Systems, XDP, Archoil, CNC Fabrication, Fuel Wheels, Kill Devil Diesel, Wheel Pros, and Ready Lift.
  • Kubota Authorized Engine Repair Center: This certification highlights their versatility and expertise beyond just road vehicles, extending their repair capabilities to Kubota engines commonly found in agricultural and construction equipment.
  • Gas Truck & Equipment Service: While specializing in diesel, they also cater to gas-powered trucks and equipment, making them a more versatile service provider.

The features that truly set LI Diesel Guys apart are consistently highlighted in customer feedback. "Mike and his guys" are frequently praised for their extensive knowledge, particularly concerning 6.0L and Powerstroke engines. This deep understanding allows them to "diagnose an issue... in the matter of a few minutes" that others couldn't. Their commitment to doing the job "right" and not hesitating to correct previous shoddy work from other shops is a testament to their integrity and high standards. The "experienced knowledgeable and friendly staff" contribute to an "exceptional customer service experience," with prompt and thorough responses to calls and questions. They offer a "2 Year / Unlimited Mileage Warranty on Most Repairs," which is a significant assurance of quality and confidence in their workmanship. Winning "BFCU'S BEST OF L.I. Truck Repair Shop THREE YEARS STRAIGHT" (and now four years straight, as per their website) further solidifies their reputation as a leader in the industry. Their use of Ford OEM parts and quick turnaround times are also notable features, addressing common pain points for truck owners.

For promotional information, LI Diesel Guys effectively leverages their strong reputation and specialized services. They promote their accolades, such as being voted "Best of Long Island Truck Repair Shop," prominently on their website and in their communication. Given the glowing testimonials, encouraging customer reviews on platforms like Google and Yelp is a powerful organic marketing tool. They highlight their specialization in Ford Super Duty and Powerstroke engines, appealing directly to a key segment of the diesel truck market. Offering a "comprehensive inspection of your truck and a long-term plan to keep it in tip-top shape" for first-time visitors is an excellent way to build trust and demonstrate their thoroughness. Promotional campaigns could focus on seasonal maintenance specials for diesel trucks, such as winter preparedness packages or summer cooling system checks. Advertising their status as a NYS Registered Inspection Station and a Kubota Authorized Engine Repair Center expands their appeal to a broader range of vehicle and equipment owners. Engaging with local trucking companies, construction businesses, and agricultural clients through direct outreach or industry events could also be highly effective. Their clear communication channels, including phone numbers (631) 823-1000 and +1 631-823-1000, and a well-maintained website, contribute significantly to their accessibility and promotional efforts. The consistent message across all their channels would be their unparalleled expertise in diesel, their commitment to quality, and their dedication to customer satisfaction.

LI Diesel Guys Location

LI Diesel Guys Customer Reviews

Mike and his guys took great care in fixing my truck. Finding terrible work from the last shop in there they didn’t hesitate to go do it right. Very knowledgeable about 6.0s and powestrokes, I won’t bring my truck anywhere else now.

Apr 14, 2025 · Joe Barci

Mike from LI Diesel guys was able to diagnose an issue that 3 other mechanic and myself have not been able to figure out for 3 months in the matter of a few minutes. They have a large Diesel facility with all the bells and whistles with a good sized experienced knowledgeable and friendly staff. I wish I knew about these guys years ago they have an exceptional customer service experience, respond to any calls and questions quickly and thoroughly and the work area is very clean and organized. I’ve been so impressed with them I live an hour and 20 away and I will use them for every repair in the future.

Feb 06, 2025 · Anthony Ferrandino

Mike and his team are awesome diesel mechanics. They do a monthly PM service on my trucks and repairs as needed. They also installed a Titan XXL fuel tank in my 2023 F450 and reprogrammed the computer to recognize the larger tank.

May 31, 2024 · Vincent Ferraro

Called and spoke to Mike the owner for advice on what truck to buy and can't thank him enough for all the insight and education for what to look out for! He took the time to make sure I understood exactly what the warning signs were. Great guy! 🇺🇸🦅👍😎

Jan 06, 2025 · Scott Keicher

Mike and his team gave me piece of mind by swapping out my CP4 pump with the DCR pump on my 2014 6.7 powerstroke. They are customer oriented company turning out great service in a timely manner. And left me with a clean vehicle. I will be back to use his services again.

Dec 06, 2024 · Jeremy Payne