“Brought in a used Tacoma I was about to buy. Eli's pre-purchase inspection found a head-gasket weep the seller swore wasn't there — saved me a $4,200 mistake. The $189 PPI was the best money I spent that month.”
Greg P.
Centennial, CO
Check engine on? Suspicious quote from the dealer? We diagnose with hard data, fix what's actually broken, and refuse to upsell. 3-year/36,000-mile warranty on every repair.
No hold music. A tech calls back in under 5 minutes.
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19
Years in Business
4.9★
Customer Rating
24/7
Emergency Service
100%
Licensed & Insured
From quick fixes to full installations — quality work, transparent pricing.
Real diagnosis, not a guess-and-replace job.
Learn moreFrom squeaky pads to full caliper replacement.
Learn moreDon't buy a used car without one.
Learn moreSynthetic, on time, no upsell pressure.
Learn moreSimple Process
Reach us 24/7 by phone or fill out our quick form. We'll ask a few questions to understand your needs.
Drop the vehicle off or use our pickup service. We run a real diagnostic and send you a written quote before any wrench turns.
We complete the repair, show you the old parts if you want to see them, and back the work with our 3-year / 36,000-mile warranty.
Testimonials
“Brought in a used Tacoma I was about to buy. Eli's pre-purchase inspection found a head-gasket weep the seller swore wasn't there — saved me a $4,200 mistake. The $189 PPI was the best money I spent that month.”
Greg P.
Centennial, CO
“Dealer quoted me $1,800 for a 'failing catalytic converter.' Rocky Mountain checked it, found a loose O2 sensor connector, and charged me $95 to fix it. They earned a customer for life on that one call.”
Sarah K.
Lakewood, CO
“I have an old Subaru with a check-engine light that three shops couldn't sort out. Eli found a cracked vacuum line in under an hour. No upsell, no surprise add-ons, just the actual fix. ASE Master is real here.”
Marcus D.
Aurora, CO
The Person Behind the Company
Owner & ASE Master Technician · License #ASE-CMT-1129
Rocky Mountain Auto Works was founded by Eli Brennan after 14 years working in a flat-rate franchise mill where techs were paid to upsell, not to fix. Tired of telling customers their car needed work it didn't need, Eli opened his own shop in 2006 with one rule: every repair gets diagnosed before it gets quoted, and every quote is the price you pay. Nineteen years and 412 five-star reviews later, that rule hasn't changed.
"Diagnose first. Quote second. Fix it right the first time."
Payment Options
Flexible financing available on engine, transmission, and timing-belt jobs — plans from 6 to 36 months with approved credit.
Get Started
Fill out the form below and we'll get back to you within the hour.
We've received your request. A technician will call you within 30 minutes. For immediate help, call (555) 089-4421.
Our Guarantee
Diagnostic fee credited to your repair — or refunded in full if we can't find the cause.
Where We Operate
We cover a 25-mile radius around Denver — including Denver, Aurora, Lakewood, Centennial, and more.
Rocky Mountain Auto Works
25-mile coverage area
The questions clients ask before they pick up the phone.
Yes — that's most of what we do. Bring us a dealer quote, we'll tell you which line items are real, which are padded, and what it should actually cost. Second opinion is $0 if you bring the quote in writing.
3 years / 36,000 miles on every repair, parts and labor. If the same problem comes back in that window, we fix it free. Not many shops outside the dealer network offer that — we can because we use better parts.
Eli is an ASE Master Technician (CMT-1129) — that's the top tier, all 8 specialties. Every tech in the shop holds at least 3 ASE certifications. Certifications posted in the waiting area; you can also verify at ase.com.