United Diesel Service

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United Diesel Service Since 1948, we've been keeping your diesel trucks on the road. For all the short trips and long hauls, you depend on your truck every day.

That’s why, when something goes wrong under your hood, you need a team you can count on to get back on the road. Since 1948, United Diesel Service has been just that. Although the trucks and tractors we service have changed over the years, what hasn’t is our family’s commitment to doing each job right. From fuel injection and engine repairs to oil changes, you can count on friendly, expert service every time you drive in. So the next time you need a hand, let us be there for you.

Diesel maintenance can feel like a lot, and you are not alone. Keep it simple -- stay on top of oil changes, watch for n...
10/10/2026

Diesel maintenance can feel like a lot, and you are not alone. Keep it simple -- stay on top of oil changes, watch for new leaks, and pay attention to changes in sound or smoke. Know more at https://www.uniteddiesel.com

Turbo not performing like it used to? Bring it in, drop it off, or drive it in, we'll take care of it. We rebuild turbos...
10/08/2026

Turbo not performing like it used to? Bring it in, drop it off, or drive it in, we'll take care of it. We rebuild turbos for light, medium, and heavy-duty trucks, marine, and industrial applications. From standard rebuilds to full internal replacements, we ensure your turbocharger's durability and longevity. Explore more at https://uniteddiesel.com/turbos

Choosing diesel help can feel like a big decision. We are a Bosch Certified Repair Center and an authorized dealer for l...
10/08/2026

Choosing diesel help can feel like a big decision. We are a Bosch Certified Repair Center and an authorized dealer for leading diesel brands. See our testing and rebuild services at https://uniteddiesel.com/testing-rebuilding

Your diesel deserves the best care. We offer complete drive-in repair services for all diesel-powered vehicles, from oil...
10/08/2026

Your diesel deserves the best care. We offer complete drive-in repair services for all diesel-powered vehicles, from oil changes to engine rebuilds. As a Bosch Certified Repair Center, we're authorized dealers for top brands like Ambac, Bosch, and Delphi. Learn more at https://uniteddiesel.com/additives

When your truck is your livelihood, trust matters. We’ve been a family-owned diesel specialist since 1948. Since 2000, w...
10/08/2026

When your truck is your livelihood, trust matters. We’ve been a family-owned diesel specialist since 1948. Since 2000, we’ve been under the hood doing careful work and treating people right. Get to know us at https://www.uniteddiesel.com

At United Diesel Service, we know the small details matter. Our factory-trained technicians ensure your diesel's filters...
10/08/2026

At United Diesel Service, we know the small details matter. Our factory-trained technicians ensure your diesel's filters, gaskets, and seals are premium, keeping your engine clean and leak-free. Trust us to solve your diesel performance issues. Explore more at https://uniteddiesel.com/filters-gaskets-and-seals

Losing power or dealing with a rough idle? Your fuel system may be the issue. We test and rebuild diesel fuel systems fo...
07/10/2026

Losing power or dealing with a rough idle? Your fuel system may be the issue. We test and rebuild diesel fuel systems for automotive, marine, and industrial engines. Know more: https://uniteddiesel.com/testing-rebuilding

Turbo lag, smoke, or low boost can point to turbo trouble. We carry new and rebuilt turbochargers for truck, marine, and...
07/08/2026

Turbo lag, smoke, or low boost can point to turbo trouble. We carry new and rebuilt turbochargers for truck, marine, and industrial applications. Browse turbo options at https://uniteddiesel.com/turbos

Need help staying compliant in California? We provide 24/7 mobile opacity testing so you can get your smoke check done w...
07/02/2026

Need help staying compliant in California? We provide 24/7 mobile opacity testing so you can get your smoke check done without pulling your trucks off the job for too long. Arrange mobile testing at https://uniteddiesel.com/24_7-opacity-testing

Diesel tech keeps changing, and repairs have to keep up. We use factory-level repair standards and advanced diagnostics ...
06/30/2026

Diesel tech keeps changing, and repairs have to keep up. We use factory-level repair standards and advanced diagnostics so we can fix it right for today’s diesel systems. Explore our testing work at https://uniteddiesel.com/testing-rebuilding

Address

1903 Penn Mar Avenue
South El Monte, CA
91733

Opening Hours

Monday 7:30am - 4:30pm
Tuesday 7:30am - 4:30pm
Wednesday 7:30am - 4:30pm
Thursday 7:30am - 4:30pm
Friday 7:30am - 4:30pm

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