Frequently Asked Questions

Neglecting oil and fluid maintenance can lead to engine overheating, poor performance, and roadside breakdowns. We suggest you get an oil change every 5,000-20,000 miles and a fluid change every 30,000-50,000 miles.

Air brakes are preferred in heavy-duty diesel trucks because of their increased stopping power compared to the conventional hydraulic brakes you see in passenger cars.

Your DPF is typically composed of ceramic or metal fibers that capture particulate matter when exhaust gases pass through them. The trapped particles are then burned off about every 300 miles, in a process called a “passive regeneration cycle.” If your DPF is clogged, we’ll force a regeneration cycle to burn off the particles.

The EGR is essentially the first component in your after-treatment system. It recirculates a portion of the exhaust gases back into the intake manifold, which is then mixed with fresh air to lower the amount of NOx during combustion.

Diamond Fleet Service specializes only in diesel engine repairs. Our talented mechanics can perform a number of repairs like cylinder head repairs, head gasket replacements, fuel injector cleaning, valve train repairs, and glow plug replacements.

In our preventive maintenance appointments, we’ll change your oil and fluids, inspect and adjust your brakes, check your electrical system (battery, starter motor), run diagnostics, and inspect for leaks in your exhaust system.

Yes, our fleet management services include a range of activities like state and federal DOT inspections, preventive maintenance, and oil & fluid service. Our Fullbay fleet management software is perfect for fleet owners as it can integrate with your ELD/GPS provider to provide you with valuable information to optimize your fleet management.

Yes, we are an official PennDOT inspection station who can perform both state and federal DOT inspections.

Diamond Fleet Service specializes in light-, medium-, and heavy-duty trucks and fleets. We work on a range of manufacturers, including Mack, Volvo, Freightliner, Peterbilt, Western Star, Kenworth, Hino, International, Caterpillar, and the upcoming Tesla Semi Truck.

Our skilled mechanics have over 35 years of combined experience working on all types of diesel trucks and engines.

We opened our doors in 2022 when James decided to take charge of his own destiny and help out other fleet owners in the process.