Diesel Repair Services - AG Automotive Service

Diesel Mechanic Portland OR

Full Service Diesel Repair From Expert Diesel Mechanics

Don’t trust just anyone with your truck. Come to Portland’s best diesel repair shop.

AG Automotive specializes in diesel maintenance and repairs for diesel trucks of all makes and models. From transmissions to engine repair, our team of experienced diesel technicians will treat your truck as if it were our own. When you need to get back behind the wheel as quickly and as safely as possible while knowing the job was done right, make AG Automotive your first call.

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Exhaust System DPF / SCR / DOC Diagnostics / Repair

The fuel and exhaust systems inside diesel engines work closely together, making it important to have a diesel engine specialist diagnosis your vehicle.

Glow Plug System Inspection / Testing / Repair

Without a functioning glow plug, a diesel engine will have trouble igniting fuel in the combustion chamber, which can lead to idling, excess smoke emissions, and other issues.

EGR Cooler System Service / Cleaning

An EGR cooler service will help keep your emission system in top notch shape with minimum breakdowns.

Diesel Engine Oil System Cleaning / Flush

A diesel engine oil flush will help keep the engine clean and the injectors in top notch shape.

Cold Start Diagnostics / Repair

The cold start injector plays a key role in the performance, so when it does have issues, the problems can detract from the overall drivability of the vehicle.

Diesel Particulate Filter Service / Cleaning

Diesel engine flushes will result in an increase in compression due to dissolving, dispersing, and removing carbon around piston ring grooves.

VGT Turbo Service

A VGT (variable geometry turbo) service will help keep the turbo running at its best.

No Matter the Model, We've Got You Covered

Ford Diesel Repair
Dodge Diesel Repair
Chevrolet Diesel Repair
GMC Diesel Repair

VW TDI Diesel Repair
Sprinter Diesel Repair
Jeep Liberty Repair
Jeep Repair

RAM Truck Repair
Subaru Repair
And many more!

Quality Auto Repair for Portland OR & Beyond!

Portland OR
Vancouver WA
Oregon City OR
Salem OR
Beaverton OR
Hillsboro OR
Northeast Portland

North Portland
Gresham OR
Clackamas OR
Tigard OR
Tualatin OR
Lake Oswego OR
West Linn OR

Milwaukie OR
Forest Grove OR
Troutdale OR
Camas WA
Longview WA
And surrounding areas!

Get Back on the Road Quickly & Safely

Partner with us and we’ll get right to the root of your vehicle’s problem rather than just treat the symptoms.

Give Us a Call

Talk with one of our service advisors to get your questions answered and set a convenient time to bring your car in for inspection.

Bring Your Car In

Talk with one of our service advisors to get your questions answered and set a convenient time to bring your car in for inspection.

We'll Handle the Rest

Talk with one of our service advisors to get your questions answered and set a convenient time to bring your car in for inspection.

These guys were so amazing! I severely needed an oil change and they got me in right away. They were efficient, kind, and didn’t try to push sales, which I really appreciate. My rating for them is 5/5, for sure!

Brittany W. Facebook Review

AG picked up and delivered my girlfriends car once they changed the oil. They were right on time to pick the car up, they even cover the seat and wear gloves while in your car. I was surprised how much they did during an oil change. During the oil change they even informed me about a light that was burnt out and didn’t even try to upsell me on it like other shops do. I will bring or have my cars picked up and brought to this shop from now on. It was such a easy process!

J.W., Google Review

I took my 2008 Chevy Duramax into AG Automotive when it was having some hard start and engine misfire issues. Turns out I needed new glow plugs and also had some bad wiring issues. AG took care of my truck quickly and even ended up saving me some money off the original estimate. AG stayed in constant communication with me while my truck was there and took care of it quickly and professionally. AG had been recommended to me based on their Diesel expertise and they lived up to their billing. The cost and professionalism were just an added bonus. Highly recommend these guys for Diesel repair and now that I know they also do gas vehicles, I’ll be bringing in my girlfriend’s Jetta from now on. Thanks AG!

Mark M., Yelp Review

AG provides the best truck service and repair we have ever seen… very professional and always gives you the best advice… willing to set a flexible schedule to fit our needs. We will definitely come back and choose AG for our future truck service and repair.

Weilei H., Google Review

I’ve been using AG Diesel since 2012 (4+ years) and they really do superior quality work. From general maintenance, to great advice, and even half an engine rebuild due to a bad head gasket, the parts they choose and the work they do is top notch.

Scott M., Yelp Review

Don’t Second-Guess the Condition of Your Vehicle

Many auto owners struggle to know if the right work was done the right way on their car. As a courtesy, we provide digital vehicle inspections and photos so you can quickly and easily see what our experienced, professional technicians are seeing. Overall, we go the extra mile to help you make informed decisions on the repair and maintenance plan of your vehicle, so you can drive with confidence every time you get behind the wheel.