On-Site Fleet Service Logo

EAST BRUNSWICK, N.J. (March 20, 2018) – On-Site Fleet Service, the largest non-dealership diesel and school bus repair provider in New Jersey, has hired Logan O’Brien Jeffries as its new Customer Service Representative the company announced.

A South Jersey native with a proven track record in sales and customer experience at the corporate level, Jeffries will be responsible for new business and onboarding within On-Site’s Kenilworth and East Brunswick territories. He will also have a hand in account management.

“This company has such a strong foundation and reputation,” Jeffries said. “There is a lot of room for growth, and I’m proud to be a part of it. To work directly with the leadership team is also very exciting.”

Jeffries began his career as a sales representative with Spectracide, a division of Spectrum Brands. His responsibilities there included generating sales materials, maintaining customer relationships and ensuring the Spectracide brand was properly presented in stores. He then joined global consulting firm AEY, Inc., where he managed business-to-business sales for Verizon. Jeffries left AEY in November 2017 to accept the opportunity with On-Site.

“Logan brings the right combination of energy and professionalism to our team,” said Rob Fraga, Operations Manager at On-Site. “We know he is going to be a key contributor in helping us continue to expand our services across New Jersey.”

Jeffries holds a B.S. in business with a focus in marketing from Fairleigh Dickinson University. He previously attended Gettysburg College, where he was a NCAA Division III athlete on the school’s football team. While in college, Jeffries served as a volunteer for TryCan, a youth sports and tutoring organization for children with autism.

About On-Site Fleet Service

On-Site Fleet Service, Inc. has been in business for more than 39 years and has grown into the largest non-dealership offering professional diesel and school bus repair in the state of New Jersey.

On-Site is a second-generation family-owned and operated repair company providing maintenance programs for school buses along with medium and heavy-duty trucks, including computerized preventive maintenance, brakes, clutches, engines, transmission rebuilding and road service. To learn more, visit www.on-sitefleetservice.com.

On-Site Fleet Service now offers an alternative to waiting for an appointment with the Dealer. Electronic engine, transmission and Brake System Diagnostics.

  • Cummins Insite
  • International’s Service Maxx, Diamond Logic Builder
  • Detroit Diesel Diagnostic Link (Detroit and Mercedes)
  • Allison DOC
  • Mack PTT
  • Volvo PTT
  • Isuzu IDSS
  • GMC Tech2Win
  • Ford IDS
  • Bendix A-com, Merritor Wabco Toolbox, & International Hydraulic ABS
  • Mitsubishi MUTIII and Mitsubishi Fuso-Connect
  • Catapillar Electronic Technician (Cat ET)
  • Hino
  • Thomas Built Bus


Over 35 years of experience! Most locations open until Midnight! Why not send your truck to us??


On-Site Truck Repair Professionals have been in business for over 35 years and has grown into the largest non-dealership doing professional diesel truck repair in the state of New Jersey.
Call any of our four locations to get your repairs done right the first time!!

East Brunswick Paul Wondoloski 732-651-1010
Rutherford Jack Nolan 201-438-6900
Kenilworth Frank Scotti 908-686-5230
Lakewood Dina Clickner 732-370-2009

What is DEF made from?

DEF is a mixture of deionized water and a mixture of synthetic automotive grade urea. It's carefully regulated by the American Petroleum Institute.

Do I have to fill the DEF tank with each fill-up?

No, depending on how much you're hauling, the rate of DEF use is about 2.5 gallons for 800 or so miles of travel. Depending on what year and model truck you have, you could have a fuel-gauge-like readout, a digital indicator or a simple "low" light.

Where can you buy DEF?

As you might expect, truck stops are likely to carry several brands of DEF, sometimes in multi-gallon containers or available at the pump. Here are just a few places we've found that carry DEF: Walmart, TravelCenters of America, Flying J Truck Stops, Love's Travel Stops, Petro Stopping Centers, and Pilot Travel Centers. Plus, you can purchase it by the gallon at many auto parts stores like Napa Auto Parts and Advance Auto.

There are more cons than pros with a DEF-equipped truck.

The only cons we can find are that the trucks cost a bit more, DEF requires some room in your truck, and it adds a nominal amount of weight. The pros include more optimized combustion, better fuel efficiency, increased power, reduced maintenance, fewer regenerations, less wear on the engine, plus it yields harmless nitrogen and water into the atmosphere, and it's highly reliable.

NOx isn't a big deal in the first place.

NOx is an element in exhaust that has been blamed for acid rain, smog and raising the overall greenhouse gas levels of the planet. DEF, as part of a SCR (Selective Catalyst Reduction) system, turns NOx into harmless nitrogen gas and water (which is present in the air we breathe). Whether you believe these man-made chemicals have a role to play in climate change or not, NOx is something we don't need to spew into the environment.

Are there weather limitations consumers should be aware of?

The shelf life of DEF is directly related to the temperature in which it is stored in. Storage temperatures between 12 and 86 degrees Fahrenheit are recommended to maintain optimal shelf life of up to 2 years.DEF does freeze at temperatures below 12 degrees Fahrenheit, but a vehicles heating system will melt DEF so it is completely safe to operate these systems in freezing temperatures. At a constant 120 degrees it would take two years for the DEF to turn into ammonia and evaporate. You can stop worrying about evaporation of DEF.

DEF will kill my fuel mileage.

Quite the contrary. Because the manufacturer is able to tune the engine any way it wants to, and then allow the SCR and DEF to take care of the pollutants, most manufacturers have discovered better fuel mileage (compared to other smog-reduction systems). Truck manufacturers claim it improves fuel mileage by as much as 5 percent.

Is DEF prone to contamination?

Yes. SCR systems are extremely sensitive to chemical impurities in the urea solution. Just one teaspoon of salt can contaminate 5,000 gallons of DEF. Purity is critical to ensuring proper function.

Is DEF safe to handle?

DEF is non-hazardous and non-toxic, non-flammable and non-explosive. Urea is the active ingredient in DEF, and it is used in fertilizers, plastics, animal feed, pharmaceutical applications and some cleaning agents. DEF is less toxic than many other fluids in a truck, including diesel fuel, engine oil, brake fluid, antifreeze and windshield washing fluid.

Page 3 of 4

Call Us


Shop Hours

7AM - 12 Midnight

Lakewood and Kenilworth locations will be open until 8pm.

  • Electrical
  • Exhaust Systems
  • Suspension Work
  • Fuel Injection
  • Lighting system
  • Coolant Service
  • Vehicle Fluids
  • Chassis Lube
  • Air Filter Replacement
  • Clutch Repairs
  • Vehicle Preventative Maintenance
  • State Diesel Opacity Inspection
  • Air Conditioning Service
  • General Truck Repair
  • Tune Ups
  • Oil Change & Lubrication
  • Brake Service
  • Battery Replacement
  • Belt & Hose Replacement
  • Transmission Service
  • Computer Diagnosis Testing
  • Overhead doors
  • Lift Gates
  • FHWA–DOT Inspections
Join Our Email List