United Diesel Service

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.

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

If your diesel truck is working every day, put maintenance on the calendar. Regular checkups help catch small issues bef...
06/24/2026

If your diesel truck is working every day, put maintenance on the calendar. Regular checkups help catch small issues before they turn into downtime. Plan your next visit at https://www.uniteddiesel.com

You deserve straight answers when your diesel truck needs attention. Our team keeps it clear and practical so you can ma...
06/22/2026

You deserve straight answers when your diesel truck needs attention. Our team keeps it clear and practical so you can make the right call for your truck or equipment. Call us: https://uniteddiesel.com/

We’ve been family-owned since 1948. We’ve been specializing in modern diesel systems since 2000, bringing today’s diesel...
06/20/2026

We’ve been family-owned since 1948. We’ve been specializing in modern diesel systems since 2000, bringing today’s diesel know-how to every job. Get to know us: http://www.uniteddiesel.com

When your diesel isn’t running right, guessing gets expensive. We do diesel engine and fuel system diagnostics, repairs,...
06/18/2026

When your diesel isn’t running right, guessing gets expensive. We do diesel engine and fuel system diagnostics, repairs, and complete rebuilds, so we can find the problem fast. Start here: http://www.uniteddiesel.com

Fuel issues don’t always mean a full repair. We test and rebuild fuel injectors and pumps, and we can supply parts when ...
06/12/2026

Fuel issues don’t always mean a full repair. We test and rebuild fuel injectors and pumps, and we can supply parts when replacement makes more sense. Call (626) 579-4832: http://www.uniteddiesel.com

Fleet downtime adds up fast. We offer full drive-in repair service for diesel-powered vehicles, so we can take care of i...
06/10/2026

Fleet downtime adds up fast. We offer full drive-in repair service for diesel-powered vehicles, so we can take care of it all in one place. Book here: http://www.uniteddiesel.com

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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