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Customer Reviews for Devil Mountain Diesel

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Here’s what some of our Walnut Creek, CA customers are saying about us:


We have had a ton of mods and maintenance done on our fleet of off-road racing support vehicles at Devil Mountain Diesel. Nice guys, very knowledgeable, and cost effective. I highly recommend them and will continue to take my vehicles to them exclusively. When it comes to our trucks we want it done once, done right, and built to withstand a beating.... These guys deliver that!

Dalton MiesenGoogle Review


5 Stars!

Jim WestonGoogle Review


Their hats keep the sun off my face in the summer and frost off my head in the winter. Get a hat, you won't regret it!

LT W.Yelp Review


My husband & I were visiting family and friends in the area when our F-250 diesel truck failed to start in my sister's driveway. After my husband tried a few fix-it ideas and troubleshooting to no avail, he called Devil Mountain Diesel to see if they had time to take a look at it on short notice, as we were scheduled to head back home to Idaho in less than a week!

They said they'd be able to fit in a diagnostic that day or next and let us know what it would take to get us back on the road. Had the truck towed on over and the guys were able to pinpoint the problem (FICM failure) and have it road-ready in time for us to leave for Idaho as planned.

Mark & Jason were friendly and professional, extending us the courtesy to squeeze in working on our truck so we could get back home. Although, unfortunately, the FICM they installed failed on us 50 miles from home, they stepped up and stood by their warranty.

After our local Ford dealer replaced the failed FICM, and we mailed back the defective part, Mark ensured that a replacement core was mailed back to us so we could receive the core credit here. In addition, a full refund of the part and labor was mailed as well.

My husband & I were impressed with Mark's follow-through, especially after my husband made an inquiry as to how long it would take for us to receive the replacement core and refund check. My husband had Devil Mountain also replace the serpentine water pump drive belt, which has been just fine.

We realize the FICM failure was not Devil Mountain's fault yet they stepped up and honored the warranty on the part and labor even though we were from out-of-state and unable to bring our truck back to them to do the warranty work. If you want a shop you can trust to stand by their work, these guys are true to their word!

Carolyn T.Yelp Review


Very impressive crew and shop. You will not be disappointed with the knowledge, cleanliness and the friendly staff.

Bill W.Yelp Review


These guys are really friendly and seem very knowledgable especially about fords I would much rather go here then the ford dealer. With that being said they charged me 120$ for what appeared to be a safety inspection. I would love to bring my truck back here but I will definitely think twice unless I have plenty of money to spend. I don't expect anyone to work for free but 120$ to tell me I need new brake pads, tie rods, and hubs is a little steep. I know places usually charge 30$ for similar inspections and some even do it for free like big o and les shwab in order to earn some business. I dropped it off because I was concerned with my engine and fuel system but didn't get any feed back on that but was still 120$ out of pocket.

Michael U.Yelp Review


These guys are awesome. I just bought a diesel my first and they took the time to show me everything I needed to know they set me up on a maintenance schedule and recommended things to up grade or repair but didn't try to out sale my needs.

Troy C.Yelp Review


After four visits to ford, plus another place, I brought my F-350 here for death wobble. Drives like a new truck! Up to Tahoe and back with no slop in the steering, let alone the scares. Thank you DMD.

David EisenlohrDevil Mountain Diesel Customer Review


I'd like to thank Mark & Jason for the repairs they did on my truck when I broke down in the Bay Area while visiting friends and family. I was very satisfied with the work done. However, to no fault of their own, a part they replaced, which was an electrical component, unfortunately failed on my trip back home. When the service shop where I live diagnosed the problem I contacted them about the part failing. They said for me to go ahead and have the part replaced and send them the defective one back to check out and they would issue me a refund, along with returning a core to cover my core charge. They stuck to their word and sent me a full refund for the part and labor.

Dennis ThibaultDevil Mountain Diesel Customer Review


Mark and Jason (the owners) have been working on all my vehicles for years. They are honest, ethical and get the job done right! I drive a high milage SUV, and it gets a lot of abuse...they keep it running great! Whether it's a tune up, oil change, or major service, they are experts at what they do. No run around...they find the problem and fix it quickly. I've had some nightmares at other shops. These guys are the best!

Brandon H.Yelp Review


Jason and Mark have been looking after my van since I bought it a few years ago. They've always been easy to work with and do great work. Huge thanks to you guys and your crew for getting the van-zilla done so quickly this week so I could make it to the races!

Michael MannionFacebook Review


Brought my 6.0 in for Bullet Proofing and some fun mods too... absolutely awesome dealing with Mark and Jason, they're top notch guys and I can't wait to get my truck back. Great, clear, honest up front kinda shop. Looking forward to the results.

Brian CookFacebook Review


BulletProofed, ARP studed, Fire ringed and new water pump 26k miles ago. Truck has run flawless since!!!!

BJ WhitmanFacebook Review


5 Stars!

Monica Daigle-KleisathFacebook Review


Saved our butt a number of times. Great mechanics!

Randy DavisFacebook Review


5 Stars!

Jeremy ClaunchFacebook Review


5 Stars!

Roger Kevin McBrideFacebook Review


Great work! I'm willing to drive an hour each way to have these guys work on our trucks!

Max SheehanFacebook Review


5 Stars!

Mike MorangFacebook Review


5 Stars!

Joseph CancillaFacebook Review


5 Stars!

Lindsay Bankert OrtizFacebook Review

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