"Reasonable price. Had a difficult wiring problem, I was from out of town — they got me in, diagnosed the problem and got me back on the road. Nice people."
R
Chino, CA · Serving the Chino Valley since 2003
We go the extra mile so you can too.
A certified heavy-duty diesel shop for fleets and owner-operators. Clean Truck Check testing, DOT & BIT inspections, DPF burnout, diagnostics — done right, on schedule.
20+
Years in Chino Valley
10+
Truck Makes Serviced
CTC
Credentialed Tester
What drivers & fleet managers say
Twenty-plus years of earned reputation.
Real feedback from fleets and owner-operators who keep coming back. Read every review on Google.
"We have been referring customers there for years and most recently the bigger trucks that we don't do CARB Clean Truck testing on. They are super cool and easy to deal with."
J
"Marty is an honest man, does great work. Been going to his shop for 10 years or more — never had any disappointments, always a great job."
T
What keeps your fleet legal
Compliance work, done in-house.
Three services every commercial operator in California can't skip. We're credentialed, equipped, and fast on all three — no subbing out, no runaround.
COMPLIANCE
Smog & Clean Truck Check
CARB Credentialed Tester
Official Clean Truck Check (CTC) emissions testing. We're a CARB-credentialed testing location — submit your OBD test and visual inspection on the same visit and stay compliant with California's heavy-duty smog program.
Learn more →SAFETY
DOT & BIT Inspections
Annual · Pre-Trip · BIT
Annual DOT & 90-day BIT inspections performed by certified technicians. Full brake, steering, tire, light and structural review with documentation you can hand to the CHP on the spot.
Learn more →DRIVETRAIN
DPF Filter Burnout
Bake · Clean · Flow-Test
Full DPF and DOC cleaning: thermal bake, pneumatic cleaning, and before/after flow readings. Restores backpressure to spec, kills regen faults, and extends filter life by years — not weeks.
Learn more →
Full capability list
Everything your rig needs under one roof.
Preventative Maintenance
Scheduled service, fluid changes, filters, inspections. Keep your PM log current and your downtime predictable.
Suspension & Steering
King pins, tie rods, leaf springs, air ride, alignment. We keep the front end honest.
Air Brake Systems
Slack adjusters, chambers, valves, ABS diagnostics. Full brake overhauls on tractors and trailers.
A/C & Heating
EPA-certified refrigerant service. Compressors, condensers, blower motors, cab comfort end-to-end.
Cooling Systems
Radiators, water pumps, thermostats, charge air coolers. Diagnose overheats before they strand you.
Electrical Repair
Alternators, starters, batteries, harness tracing, parasitic draws, full lighting systems.
Trailer Repair
Brakes, axles, suspension, ABS, lighting, landing gear, doors. Vans, reefers, flatbeds.
Welding & Fabrication
Frame repair, brackets, mounts, exhaust, crossmembers. MIG and stick on the floor.
Diagnosis & Repair
OEM-level scan tools across Cummins, Detroit, International, Hino, Isuzu.
Makes, engines & components
If it hauls freight in the Inland Empire, we service it.
From one-ton work trucks to Class 8 tractors — factory training and OEM-level scan tools across the full domestic and import fleet, plus the engines, transmissions and components inside them.
Peterbilt
Class 7–8 · Heavy
Cummins · Detroit · PACCAR
Kenworth
Class 7–8 · Heavy
Cummins · PACCAR
Freightliner
Class 6–8 · Heavy
Detroit · Cummins
International
Class 6–8 · Medium / Heavy
Int'l · Cummins
Hino
Class 4–7 · Medium
Hino J-series
Isuzu
Class 3–6 · Light / Medium
Isuzu 4H / 6H
Dodge / Ram
2500 · 3500 · 4500 · 5500
Cummins 5.9 / 6.7
Mercedes
Sprinter Vans
OM642 · OM651
Mack
Class 8 · Vocational
Mack MP · Cummins
Volvo
Class 8 · Tractor
Volvo D11 / D13 · Cummins
Cummins
Engine
Detroit
Engine
PACCAR
Engine
International
Engine
Isuzu
Engine
Hino
Engine
Volvo
Engine · Truck
Mack
Engine · Truck
Peterbilt
Truck
Kenworth
Truck
Freightliner
Truck
Allison
Transmission
Eaton
Transmission
Why MTR
Twenty years, one shop, no shortcuts.
We've been on the same corner in Chino since 2003. Fleets come back because we don't guess — we diagnose, document, and fix it once.
CARB Clean Truck Check Credentialed
Official testing location, not a sub. Your OBD & visual test, uploaded the same day.
Certified, trained technicians
OEM-level training across Cummins, Detroit, International, Hino and Isuzu.
Full in-house capability
Diagnostics, brakes, DPF, welding, A/C, electrical, trailer work — we don't sub out the hard parts.
Fleet-friendly scheduling
PM programs, same-day inspections for DOT/BIT, and honest turnaround windows.