Very helpful sales team. Definitely recommend this company.
Very helpful sales person. I highly recommend these guys.
By Customer
Saturday, November 7, 2026 · Customer reviews of US businesses
The Fair Hearing score
Excellent
724 reviews
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Honesty, pricing, process and quality scores appear once 5 customers have rated them.
Shop Aftermarket Diesel Parts for your Cummins, Powerstroke, Duramax, or any Diesel Vehicle. We specialize in quality products with better customer service!
Diesel Ops (dieselops.com) has 724 customer reviews on The Fair Hearing, with an average rating of 4.7 out of 5.
724 approved reviews, newest moderated first
Very helpful sales person. I highly recommend these guys.
By Customer
The products were good quality and came as expected. At the time of the order Diesel Ops sent me the Installation Instructions so I could read them while I was waiting for the parts to ship to me. Not much for Instructions on removing the 8 exhaust sensors but you can watch a video on YouTube. Make sure you use lots of penetrating oil/spray on the lower EGR bolts for the long EGR pipe. These bolts will break on you! I started spraying them a week ahead of time and I still had to slowly work them back and forth with spraying in between working the bolts out and back in. I recommend slowly working these bolts before your parts arrive so you Installation will go faster. My bolts were still knurled after taking it slow with them. Use bolts from a different location when you put the new plate on. (The other bolts will have better threads left on them.) My only complaint is the smaller cooler lines come with a barb but no hose clamps and the factory uses a crimped clamp that is not reusable. Not a big deal if you have an Auto Parts store near you but I would recommend getting some ahead of time. You'll have lots of fun with the lower radiator hose connection. Take out the inner fender and have a Buddy on stand to help for a few minutes. The end product is very impressive and has a great sound with good turbo howl.
By Regular J.
GREAT TO HAVE A COMPANY CARE! FROM INITIAL ORDER TO THE SHIPMENT! I WILL DEFINITELY ORDER AGAIN! THANK YOU DIESEL OPS!
By Jonny P.
I love the service very very nice to work with. I was missing a part they told me they didn't get there I was fine they got to very fast after get in the products they sell 100% awesome I gave a five because these are on the ball easy to work with . Thank. You Mike from Colorado.
By Mike N.
Loved my experience, great customer service, easy to order online, and great pricing.
By Richard B.
Fast service and delivery!
By Brandyn L.
looking forward doing business with you again.
By KATHLEEN J B.
Good place to buy, bought a tuner and it showed up on time. Support was able to answer my question without a problem. Would buy from again.
By Customer