Sinister Diesel Truck Owners Reviews 2025

Latest Reviews and Complaints

craigsjw of Shelby, US

Jul 13, 2023 9:13 pm EDT

Sinister Diesel 2 bad alternators!

I bought the first alternator & in a matter of weeks it was done for, so they sent a replacement (refurbished, as a favor to me) & within a matter of days it went. Had both alternators tested & yes they were faulty, nothing wrong with installation. I've tried repeatedly to contact them with no avail, & if your reading this review a paid good money! You would think they would stand behind their product & customers!

Desired outcome: NEW replacement alternator not a refurbished!

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How responsive is Sinister Diesel's customer service?

0 Resolved

3 Unresolved

Total complaints: 3

Resolved complaints: 0 (0%)

Unresolved complaints: 3 (100%)

Absolutely frustrating 🫠
It's quite possible that Sinister Diesel is not aware of the complaints or rarely monitors their existence because we find it hard to believe they don't care about their customers. We advise reviewers to be very careful and have a backup plan if their issue isn't addressed. Check out other unresolved complaints on ComplaintsBoard to avoid problems caused by Sinister Diesel's silence.

How is Sinister Diesel’s rated by diesel performance enthusiasts?

Sinister Diesel’s earns a 1.0-star rating from 0 reviews and 3 complaints, showing that the majority of diesel performance enthusiasts are dissatisfied with their aftermarket parts and customer service.

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K. Wuckert

Jun 07, 2023 1:17 pm EDT

Verified customer

Sinister Diesel Quick Delivery and Solid Products, but Bracket Issue with Sinister Diesel Kit

Got my stuff from Sinister Diesel and it came in pretty quick. Only thing that kinda sucked was the bracket for the kit was all wrong. But hey, it's all good, I just had to rig it up a bit to make it work. Other than that, everything was solid and worked like a charm. Definitely gonna keep coming back to these guys for my diesel needs.

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C. Douglas

Jun 05, 2023 12:16 pm EDT

Verified customer

Sinister Diesel Impressed with Sinister Diesel's Quality and Timely Delivery!

Got my order from Sinister Diesel and I gotta say, I'm pretty stoked about it. Haven't had a chance to put the parts in yet, but they look like they're made of some solid stuff. And the best part? I managed to get it all in before the April 30th deadline. Score!

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that guy Tony

Los Angeles, US

1 comments

that guy Tony of Los Angeles, US

Sep 23, 2023 7:27 pm EDT

Verified customer

degas bottle not fit for 6.0. send back. not full refund -$70

exhaust manifold was stolen. no refund. no replacement.

customer service (Marsha Eubank) HORRIBLE. didn`t help any.

never had such a bad service. work before with AFE power, Mishimoto and Banks never had a problem like that

Sinister Diesel earns a trustworthiness rating of 91%

Highly recommended, but caution will not hurt.

Our conclusion: After a detailed review, ComplaintsBoard finds Sinister Diesel to be a trustworthy company. Although there's a 0% resolution rate for customer complaints, which deserves attention, Sinister Diesel is known for their high standards and safety. If you're thinking about dealing with Sinister Diesel, it's wise to check how they handle complaints.

Sinister Diesel has claimed the domain name for sinisterdiesel.com for a long time, which suggests that the website is established and has a history of being in operation. This is a positive sign, as it indicates that the website has been around for a while and may have a reputation to maintain.

Sinisterdiesel.com has a valid SSL certificate, which indicates that the website is secure and trustworthy. Look for the padlock icon in the browser and the "https" prefix in the URL to confirm that the website is using SSL.

Sinisterdiesel.com has been deemed safe to visit, as it is protected by a cloud-based cybersecurity solution that uses the Domain Name System (DNS) to help protect networks from online threats.

Several positive reviews for Sinister Diesel have been found on various review sites. While this may be a good sign, it is important to approach these reviews with caution and consider the possibility of fake or biased reviews.

Sinister Diesel reviews first appeared on Complaints Board on Jun 5, 2023. The latest review 2 bad alternators! was posted on Jul 13, 2023. Sinister Diesel has an average consumer rating of 1 stars from 3 reviews. Sinister Diesel has resolved 0 complaints.