Just experienced several different conversations with Anthony dealing withFinding a difficult part. I cannot say enough good things about these contacts to do him justice. His demeanor, prompt responses, all around strong desire to help solve my parts problem are unmatched and far above the norm. Just wish others involved in my situation were half as good as Anthony.

These guys are awesome!! Ive been here twice and always left with a smile. They are super knowledgeable and honest. The first diagnosis was spot on and gave me peace of mind, but included a warning that there was a strong possibility that one or more of my injectors was returning too much fuel, causing my truck to go into limp mode from low fuel rail pressure while under heavy load. I finally pulled the trigger on having them pull and test the injectors, after all it has 350,000 miles on it. Testing confirmed the initial diagnosis so they installed new injectors and repaired a leaking coolant line to the turbo which again gives me peace of mind that I am good to tow my trailer to the Sierras without worrying about failures. I have every confidence in recommending them to any diesel owner that needs top notch mechanical work done by honest people that wont take advantage like so many diesel shops do. They will take the time to explain things in such a way that you will feel comfortable making an educated decision. This is the only shop that will ever see my truck for any mechanical issues! I wish I could give them 10 stars!!!Update: I was preparing for the Sierra trip I mentioned when I noticed a spot of coolant under the truck. I called Donovan and he told me to bring it in and he would check it out. I figured it was something related to the hose that they had fixed, which they didnt charge me for and his tech probably spent 2 hours on it. It turned out that my water pump was starting to leak, not bad yet and there was absolutely no pressure to replace it, but being the good guy that he is, Donovan ordered the parts and got it done for me as quickly as he could to ensure that I could take my trip to the Sierras without the threat of losing my cooling system 300 miles away from home. I got back this weekend from the Sierras and the truck ran amazing! It pulled up the grades without breaking a sweat and ran nice and cool like it was suppose to and I was pulling through 100 degree weather. Like I said before, Diesel Injection Service is the only shop that will wrench on this truck from now on.

Absolutely the best shop! Professional and honest. On the go and top notch mechanics. I live a block from 4 injector shops in Signal hill but travel 66 miles to this shop. Donavan, Anthony, and staff are all the best. Thank you for your honest and fair pricing.

Quality work. Friendly people. Reasonable prices.

Informative, excellent. Thank you Donvan.

I went in there to get a cold start valve for my lb7 duramax to figure out why my truck was losing prime. They offered to give advice to help out rather than make me wait for an appointment. The advice they gave worked and my truck is running like new after the injectors install! Thanks fellas for the awesome customer service! Semper Fi!

I purchased a set of injectors for my Dodge 5.9 cummins from this place around 2 months ago. The quality on the injectors that were sold to me is impressive. I truly recommend this shop without hesitation. Price is fair and very helpful staff.

Very professional shop the guys know their stuff there. I have sent numerous jobs to them and they have always got it done in time and did it right. And to top it off their Bosch and stanadyne certified

Donovan, Anthony and the crew are so professional and know diesels. The only place to go for diesel motor service.

Excellent service, thorough, trustworthy and really good people. Very qualified. My Chevy 5500 is new to me, they answered all my questions and did more than I thought of but the cost was less than I expected and very reasonable. I’ve been to many shops with my Powerstroke, and many more with the big rigs I drive cross country. Exceptional business. Diesel Injection Service is the best of the best. They deserve more than 5 stars!

Great people, great service. Highly recommend.

I had a set of Duramax injectors tested and balanced by Anthony. He went above and beyond to repair and make right what another company completely screwed up. Communication was outstanding from the time he received the injectors up to the time he shipped them. It was well worth the time and money. I would highly recommend this great business.

Great service, great people. I brought in my 1990 Cummins for a ve pump issue they fixed it up truck feels better than new. I am very happy with their service.

I was having a hard time finding some delivery valve crush washers for my 1981 Mercedes 240D. I was referred through another shop to DIS and spoke with Anthony. Within minutes he had confirmed they had 3 in stock (cheap too, thankfully). Before shipping the washers, he even texted me the diagram to ensure we were talking about the correct part. Extremely impressed, and now I have a reliable source for future work for my classic car. Extremely happy!

I highly recommend Diesel Machine shop. They are very professional. They run a clean and organized business with integrity. Cant beat the prices for their outstanding services.

This place is the number one stop for anything related to diesel injection. I am a diesel mechanic myself who owns a Dodge Ram Cummins but was not too familiar with the injection system on my truck as I recently bought it. I had what I thought was a fuel knock. Well I took my truck over to their shop and Anthony at the front desk was great help. He came out to listen to the truck and confirmed that it sounded like a small fuel knock and that they could use their scanner to confirm it. Well, long story short I ended up buying a complete set of new Bosch injectors from them and installing them into my truck. The truck now runs beautifully and the idle has never sounded better. Diesel injection has awesome customer service, perfect quality products, and the knowledge / experience to back it all. On top of that they BEAT any online price I was able to find for new injectors by a mile! If you need anything diesel injection related don’t go anywhere else, visit these guys!

I am recommending Diesel Injection to everyone I know that has a Diesel. I went there not knowing anything about diesels. They took their time and helped me to understand the differences between gas and diesel. The staff is very knowledgeable. Im so glad I went there and I will continue to as long as I have a diesel.

Great service, brought my injector from a dt466 to have diagnosed, cleaned and o- rings replaced. All checked out good. Unfortunately I still cant figure out whats wrong with my truck. Highly recommend and worth the wait. Which was about 24hrs. Thanks guys.

Ive driven my 6.0 excursion for 2 weeks now, after having it worked on at Diesel Injection Service. And after going through 3 mechanics, Ive finally found the doc for my truck. The service is the best around, and the same goes for their mechanics. I am more than pleased. I actually want to keep my 6.0 now. Thanks Donovan!

Diesel Injection Service in Colton, CA is top notch. They were kind, courteous and professional. I took my Chevy 2500HD to them for routine maintenance and a few repairs. They kindly dropped me off at my rv and picked me up once the repairs had been completed. I highly recommend them. They are affordable, kept me informed the whole way through, and they never attempted to sell me any unnecessary services.

Great guys good work A+++

I love this shop!! Donovan is the best sails advisor there really cool and professional I highly recommend the shop to anybody who has a Dodge four-door Chevy diesel or a diesel of any kind for injector work these guys know what theyre doing

Saved me over $3000 over dealer price. Donovan was a great help. My truck sounds and drives great.

Still the best in So Cal

Awesome clean facility. Donovan is very knowledgeable and helpful. Next time my truck breaks Ill be coming back!!😎

Great place, very efficient

These guys treated me great! My days of jacking around with those internet scam artist are over! I might pay a little more but the quality has always been there!!DamianCorona Ca,

I have had work done here over the 4 years my transport company has been in business. Donovan and the guys have always come thru for us. Small business like ours need qualified mechanics to keep us on the road. We have been thru some of the other local shop, and been very dissapointed. We will keep comming here. Thank you guys.

Everyone is truly awesome at Diesel Injection Service!!!! I highly recommend their services!

Very helpful, they know thier business, they do great quality work.

The guys here were real helpful and pleasant to deal with

A couple of weeks ago I replaced the fuel injectors in my 2003 Dodge Ram Cummins and although I followed all the directions exactly it ran worse than before. I took it to Diesel Injection and told Donavan my problem. I only had a short period of time to get it running before our vacation. Donavan had it torn down and the injectors bench tested and found that five out of six failed. I got them replaced under warranty and Diesel Injection got them installed that same day. Needless to say, I got my truck back running great and am now sitting under the awning of my fifth wheel by the beach having a cold one. My many thanks to Donavan and his crew, I can only hope that my past customers and former employees think half as well of me as I do of the service that I was given by this excellent establishment.Curt Gonzales

On 08/19/2016, my f350 dually what i thought was the 6L injector problem was actually the FICM board, Donovan and the crew did an outstanding job and now a week later the old F350 with the new board and some HotShot the 6L runs as strong as ever.

Good stuff good staff easy to work with

The people that work are professional, very knowledgeable,and very fair

Customer service is very professional and trustworthy

Great service!