Diesel repair Chico CA. Cummins, Duramax, PowerStroke, Mercedes diesel. DPF, EGR, DEF, glow plugs. Oil from $169.99. Written diagnosis. NAPA Gold. (530) 826-4275.
Full diesel service — oil changes, DPF/EGR/DEF diagnosis, glow plugs, fuel system, turbo. Diesel oil from $169.99. OEM-level diesel scan tools. Written diagnosis before any repair. NAPA Gold warranty.
Real diesel repairs at Tedious Auto Repair — Chico, CA.
Tedious Auto Repair services all major diesel trucks in Chico — Ram Cummins, Silverado/Sierra Duramax, F-250/F-350 PowerStroke, and Mercedes Sprinter/diesel SUVs. Diesel oil change from $169.99 with API CK-4 oil. Full DPF, EGR, and DEF system diagnosis with OEM-level scan tools. Written report before any repair. NAPA Gold 3-year warranty. By Buddy Rausch, Owner / ASE Master Technician · Reviewed May 20, 2026
Diesel 15W-40 from $169.99 with API CK-4 rated oil. Motul diesel $199.99. GM Dexos D 0W-20 $199.99. Cummins requires 15W-40 CK-4. Duramax requires dexos1 or dexos2 spec. PowerStroke requires WSS-M2C171-F1 spec. We verify your OEM spec before every drain — never a generic diesel oil on a truck with a specific requirement.
DPF (diesel particulate filter) regen failures, EGR cooler leaks, DEF quality faults, NOx sensor failures, and SCR catalyst codes all diagnosed with OEM-level scan tools and live data. We identify the actual failed component before recommending replacement — a DPF code is often a sensor, not the filter itself.
Glow plugs pre-heat the combustion chamber for cold starts — diesel engines have no spark plugs. Failed glow plugs cause hard starts on Chico's cold winter mornings (35–40°F), white smoke at startup, and rough cold idle. Replaced as a set at 100,000–150,000 miles or at first hard-start symptom.
Fuel filter replacement every 15,000–25,000 miles. Injector diagnosis with return flow testing. High-pressure fuel pump pressure testing. Lift pump diagnosis on Cummins trucks. We test fuel system pressure and injector return before recommending any fuel system component replacement.
Variable geometry turbo actuator failures (common on 6.4L PowerStroke and Duramax LML), boost pressure testing, wastegate diagnosis, intercooler inspection. Oil change interval compliance is critical for turbo longevity — we document your service history at every visit.
OM651 and OM642 diesel engines. EGR cooler failure, DPF regen, glow plug failure, swirl flap motor — common Sprinter issues we diagnose and repair. Mercedes-spec diesel oil (229.51 or 229.52) required — not interchangeable with truck diesel oil. Also: GL350d, GLE350d, GLC300d.
Most common diesel we service. EGR cooler failure (coolant in exhaust, white smoke). DEF system NOx sensor faults. High-pressure fuel pump wear on high-mileage trucks. Glow plug failure after 120,000 miles. Oil: 15W-40 CK-4, every 5,000–7,500 miles in Chico's heat.
B20 biodiesel compatibility issues with Chico's agriculture-area fuel supply. DPF regeneration problems from excessive short-trip driving. CP4 high-pressure fuel pump failures on older LML trucks. Oil: dexos1 Gen 3 or dexos2 spec per application.
EGR cooler and radiator failures. Turbo actuator faults (P0299). Fuel filter water separator neglect causing injector damage. Oil: WSS-M2C171-F1 specification 10W-30 or 5W-40 per year model. Never use standard 15W-40 in a PowerStroke without verifying spec.
Yes — Cummins (Ram 2500/3500), Duramax (Silverado/Sierra 2500/3500), PowerStroke (F-250/F-350/F-450), and Mercedes diesel (Sprinter, GL350, GLE350d). Diesel oil change from $169.99 with API CK-4 rated oil. Full diagnostic capability including DPF, EGR, and DEF system codes.
Diesel 15W-40 from $169.99. Motul diesel $199.99. 0W-20 Dexos D (GM PHEV/diesel spec) $199.99. API CK-4 rating required on all late-model diesel engines. Includes free 100-point digital inspection.
Yes. DPF (diesel particulate filter) codes, EGR (exhaust gas recirculation) faults, and DEF (diesel exhaust fluid) system issues all diagnosed with OEM-level scan tools. We provide a written report of findings before any repair recommendation.
Glow plugs pre-heat the combustion chamber for cold starts — diesel has no spark plugs. Failed glow plugs cause hard starts in cold mornings (Chico's 35–40°F winter temps), white smoke on startup, and rough cold idle. Typically replaced as a set at 100,000–150,000 miles.
Yes. Sprinter OM651 and OM642 diesel engines. Common issues: EGR cooler failure, DPF regeneration problems, glow plug failure, and swirl flap motor failure. Mercedes-spec diesel oil required — not generic 15W-40.
Oil: every 5,000–7,500 miles for most diesel trucks in Chico's climate. DEF: topped off as needed (about every 3,000–5,000 miles). DPF regeneration: monitored at every service. Fuel filter: every 15,000–25,000 miles depending on fuel quality.
Oil from $169.99 · DPF/EGR/DEF diagnosis · Written estimate · NAPA Gold warranty
📍 2695 CA-32, Chico, CA 95973 · Open Mon–Fri 7AM · Sat 8AM · Sun 9AM — Close 5PM · Open 7 Days
Ram 2500/3500. 5.9L 12v, 5.9L 24v (dowel pin failure), and 6.7L (CP4.2, EGR cooler, DPF/DEF). Chico's most common diesel truck.
Silverado/Sierra 2500/3500. LB7 injectors, LMM/LML EGR and DPF, LML CP4 pump, L5P DEF system.
F-250/F-350/F-450. 6.0L EGR/oil cooler, 6.4L DPF, 6.7L turbo actuator and CP4.
Intermittent stall · gear housing migration · fix before cracking.
2695 CA-32, Chico · (530) 826-4275 · Cummins · Duramax · PowerStroke
Buddy Rausch founded Tedious Auto Repair in Chico, CA in 2007 and has been serving Butte County for 18+ years. As an ASE Master Technician, Buddy personally oversees diagnostics and quality control on every vehicle. All content on this page reflects real procedures, OEM specifications, and cases seen in the shop. About Buddy Rausch, ASE Master Tech →
Buddy Rausch founded Tedious Auto Repair in Chico, CA in 2007. ASE Master Certified. 18+ years serving Butte County. About Buddy Rausch