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.

Diesel trucks need consistent care to handle demanding tasks. Ensure your vehicle is in top shape with a comprehensive c...
05/27/2026

Diesel trucks need consistent care to handle demanding tasks. Ensure your vehicle is in top shape with a comprehensive check-up at United Diesel Service. Visit http://www.uniteddiesel.com

Diesel power keeps Southern California businesses moving. We support automotive, marine, and industrial diesel owners. W...
05/25/2026

Diesel power keeps Southern California businesses moving. We support automotive, marine, and industrial diesel owners. We also work on tractors, pumps, ejectors, and fleet trucks. Learn more: http://www.uniteddiesel.com

Your diesel truck deserves the best care. Our drive-in checks catch issues early, keeping you on the road without interr...
05/23/2026

Your diesel truck deserves the best care. Our drive-in checks catch issues early, keeping you on the road without interruptions. Learn more: http://www.uniteddiesel.com

Established in 1948. Focused on diesel engine repair since 2000. Our focus is still the same: do the job right. Learn mo...
05/21/2026

Established in 1948. Focused on diesel engine repair since 2000. Our focus is still the same: do the job right. Learn more: http://www.uniteddiesel.com

Small parts can prevent big leaks. We stock filters, gaskets, and seals to help keep your diesel sealed and protected. A...
05/15/2026

Small parts can prevent big leaks. We stock filters, gaskets, and seals to help keep your diesel sealed and protected. Ask at the counter: http://www.uniteddiesel.com

In Southern California, diesel trucks and equipment are the backbone of many businesses. We keep your engines running st...
05/13/2026

In Southern California, diesel trucks and equipment are the backbone of many businesses. We keep your engines running strong and reliable with expert care you can count on. Trust United Diesel Service to get the job done right. Visit us: http://www.uniteddiesel.com

If you manage a diesel fleet, emissions compliance can’t wait. We offer mobile opacity testing to help you stay ready. S...
05/07/2026

If you manage a diesel fleet, emissions compliance can’t wait. We offer mobile opacity testing to help you stay ready. Set it up: http://www.uniteddiesel.com

Credentials matter when it’s diesel. We’re a Bosch Certified Repair Center, so you can feel confident your truck is in t...
05/05/2026

Credentials matter when it’s diesel. We’re a Bosch Certified Repair Center, so you can feel confident your truck is in trained hands. Connect with us: http://www.uniteddiesel.com

Turbo not pulling like it used to? We handle turbocharger service and rebuilding so you can get your power back. Start h...
04/29/2026

Turbo not pulling like it used to? We handle turbocharger service and rebuilding so you can get your power back. Start here: http://www.uniteddiesel.com

When a diesel runs rough, guessing gets expensive. We do fuel injection testing to find the real issue and fix it right....
04/27/2026

When a diesel runs rough, guessing gets expensive. We do fuel injection testing to find the real issue and fix it right. Set up service: 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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