Very knowledgeable service and fast shipping
Very knowledgeable service and fast to ship and send emails
By Customer
Sunday, November 8, 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 knowledgeable service and fast to ship and send emails
By Customer
Product shipped the next day, videos helped with my choices, overall satisfied
By Travis
Ordered a Truxedo lo pro q when they matched the price. Had the cover in 2 days.
By CustomerJohn G.
Product fit and worked perfect. Wonderful customer service. Product arrived faster than expected. Very happy, great company to do business with.
By Jake
They acknowledged the instructions were wrong and needed fixed asap. However still charged me $90 to replace a small piece of the kit. Which the whole kit was only $370. The guy said "im on your side, but thats the price. I dont want you to think im ripping you off" thats not how you conduct business and youll never get mine again.
By Josh
Response from Diesel Ops· Oct 18, 2016
Hello Josh, Last we talked I did agree that the instructions SHOULD have made mention to the fact that the firewall may need to be modified. This was above and beyond and you modified the downpipe which resulted in it being unusable. A call beforehand could have prevented that. I do apologize for the inconvenience and I want to make sure you know that We did not make these instructions, nor do we have any control. I did however take the extra time to do everything I could to get you the single piece you needed that wasnot even able to be sold on its own, but I still made it happen for you and I am sorry but yes we charged you what we were charged. I understand you are upset that you had to spend more money to replace a ruined pipe, but I did everything I could to help you out, I cannot simply send out free parts when a customer modifies a part that ends up not working. I can assure you that had we received a phone call prior to the modification, we could have swapped kits, taken a return or even credited a few dollars for the inconvenience, but that was not the case. If you would like to talk any further, i am always available at 888-992-7299 Ext.701 and we can talk about how to move forward as I thought this was all resolved weeks ago.
Parts arrived in a timely manner. Installed the new thermostat and housing. Now my temperature gauge is back in the normal position. Went with the 203º thermostat and all is good.
By Norm B.
Great product at a great price. Being a disabled vet this instalation was a breeze with included hardware.
By Kyle
Got all my parts except my tuner never told me if it was on its way or anything still haven't got it
By Andrew
Response from Diesel Ops· Oct 18, 2016
Hello Andrew, We apologize for this delay. I see everything has made it to you. I will be giving you a call shortly to discuss how we can make this up to you as this was a mistake on our end and we 100% need to make it right. I look forward to speaking with you soon, -JD