Heavy-Duty Diesel Mechanic Services in Bakersfield, CA

When it comes to heavy-duty diesel mechanic services in Bakersfield, CA, Delaney & Ahlf Diesel Service Inc. is the trusted name for truck drivers and fleet managers. We’ve been delivering reliable, high-quality repair and maintenance services for your heavy-duty vehicles since 1959! Our diesel technicians have decades of combined heavy-duty mechanic experience. Reach out to us today with any questions, to request a quote, and to schedule service!

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What Makes Delaney & Ahlf Diesel Service Different?

Our experienced team is equipped to handle everything from preventive maintenance to complex repairs, and we pride ourselves on transparent pricing and top-tier customer service. Our services include federal DOT inspections, California state BIT inspections, RV repairs, and welding and fabrication services.

Whether you’re an owner-operator or managing a fleet, we've got everything you need to keep your vehicles running smoothly, efficiently, and safely.

Here’s what sets us apart

Decades of Expertise: Serving the industry since 1959, we bring over 60 years of knowledge to every service.

15 Spacious Bays: We can accommodate fleets of all sizes with ease.

World-Class Customer Service: Transparent pricing, clear communication, and expertise in sourcing hard-to-find parts are the cornerstones of our approach.

Frequently Asked Questions

What Areas Do You Serve for Diesel Services?

We serve Bakersfield, CA, and nearby cities, including Oildale, CA; Lamont, CA; Arvin, CA; Shafter, CA; Wasco, CA; Taft, CA; Delano, CA; Tehachapi, CA; Porterville, CA; Lindsay, CA; Corcoran, CA; Mojave, CA; California City, CA; Rosamond, CA; Lake Isabella, CA; Ridgecrest, CA; Buttonwillow, CA; McFarland, CA; Boron, CA; Frazier Park, CA; Lebec, CA.

What is the Difference Between a DOT and BIT Inspection?

A DOT inspection ensures compliance with federal safety standards, covering vehicle safety and operation. A BIT inspection (Basic Inspection of Terminals) is specific to California and evaluates a fleet’s maintenance practices and vehicle safety to comply with state regulations.

How Often Does a Bus Need to Be Inspected in California?

Buses in California must be inspected every 90 days or every 45 calendar days, whichever comes first, based on their operational use. This ensures compliance with state safety standards. If a bus is out of service for over 45 days, it must be inspected before returning to operation.

How Often Should I Schedule Preventive Maintenance for My Fleet?

We recommend scheduling preventive maintenance every 10,000–20,000 miles or as outlined in your vehicle’s service manual. Regular maintenance minimizes the risk of unexpected breakdowns and prolongs the life of your fleet.

How Can I Get Diesel Services?

Getting started is easy. Call us at 661-322-5064 today to schedule your service or discuss your fleet’s needs. Delaney & Ahlf Diesel Service Inc. is here to keep you moving forward.

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Our Services

At Delaney & Ahlf Diesel Service Inc., we provide comprehensive diesel services tailored to keep your fleet performing its best. From routine preventive maintenance to federal DOT and California BIT inspections, our skilled team guarantees every detail is covered.Need custom welding or fabrication? We’ve got you handled. With 15 bays and advanced equipment, we’re prepared for fleets of all sizes. Rely on our decades of experience for unmatched expertise, fast turnaround, and the technical precision your vehicles demand.

Testimonials

Jason Weatherford

Great fast service. The men there are top notch we were in a bad spot and they got right on our issue and had us out the door highly suggest them.

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Dave Ballerstein

Been doing business with them for over 40yrs best damn shop in the country....and they work on the whole truck not just engines...Here to get a tune up and service and whatever else I need

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A.M. Phaneuf

You are not usually glad to spend money on repairs, but I was happy to have had them do the work. Great place. Good folks.

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Gildardo Rodriguez

Everyone I spoke with had that easy speaking way. Knowledgeable and great to get along with. Best service in town honestly.

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Loran Blasdell

Amazing shop with extremely friendly, knowledgeable, and helpful staff

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Michael Mauro

Fast, friendly and knowledgeable service. I definitely recommend giving this shop your business.

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Jason Weatherford

Great fast service. The men there are top notch we were in a bad spot and they got right on our issue and had us out the door highly suggest them.

Google IconStars icon

Dave Ballerstein

Been doing business with them for over 40yrs best damn shop in the country....and they work on the whole truck not just engines...Here to get a tune up and service and whatever else I need

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A.M. Phaneuf

You are not usually glad to spend money on repairs, but I was happy to have had them do the work. Great place. Good folks.

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Gildardo Rodriguez

Everyone I spoke with had that easy speaking way. Knowledgeable and great to get along with. Best service in town honestly.

Google IconStars icon

Loran Blasdell

Amazing shop with extremely friendly, knowledgeable, and helpful staff

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Michael Mauro

Fast, friendly and knowledgeable service. I definitely recommend giving this shop your business.

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Contact Us

3901 Mercury Ave, Bakersfield, CA

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661-322-5064
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Service: service@dnaparts.com
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Parts: parts@dnaparts.com

Hours

7:00 AM to 4:00 PM
Monday to Friday

Saturday: By Appt. Only