About Business
Grease Monkey brings expert Car Repair solutions to the local community in Thornton, CO, Thornton. From Auto repair shop, Oil change service, Car repair and maintenance service to complex Car Repair projects, they maintain high standards of service quality. Local residents in Thornton, CO appreciate their attention to detail, leading to a consistent 4.4/5 rating from 502 reviewers. By focusing on the specific requirements of the Thornton, CO area, they have built a loyal following among local Car Repair customers. Explore their full range of Car Repair services and see why they are a preferred choice for customers across Thornton, CO and beyond.
Google Reviews
Emmal Lundstrom
★★
☆☆☆
8 months ago
Isaac was good at explaining everything…. But I asked if they refilled my windshield wiper fluid and I was told yes ma’am we did and that’s not true. There was no windshield wiper fluid so it makes me wonder if everything else was checked.?
Michelle Rogers
★★★★★
2 months ago
Great service! The employees are very helpful and courteous.
Mary Violet
★★★★★
a year ago
I went in, wondering what was wrong with my car and when the gentleman told me that I needed a new radiator, I wasn’t familiar with that part of the car so he showed me exactly what we were doing and what needed to be done and I really appreciate them for that
Georgia Smith
★★★★★
Edited 6 months ago
Biggest of shout outs for Anthony and the very knowledgeable technicians that took great and detailed care of my car today. (Oil change)I will return for upkeep as needed .
mary rutherford
★★★★★
7 months ago
I work nights and waited until they opened. I explained that and they were so kind and understanding. They did there best and even came in to explain I needed a new air filter. I AM VERY PLEASED with my service.
Jennifer McCann
★★★★★
5 months ago
Great service, was in and out in a timely matter, they checked all my fluids, and honored my $20 off coupon.
David Choi
★★
☆☆☆
3 years ago
Came here to get an oil change for my work pickup. Being able to just drive up without having an appointment and get an oil change was a big plus as this location does not seem too busy. It's not the cleanest location I've been to but it's also an oil change spot so... One of the employees had a dog that was barking, whining, and running around the whole time in the shop area which didn't seem safe and was a bit annoying. My biggest complaint is that I asked for 3 things to be done, one of them being the tail light to be changed out. When I was being checked out, I was not made aware that the tail light was not changed out. That would've been good to know. They also are recommending an oil change every 3000 miles for synthetic. I asked why and he said that's what they recommend. Dodge recommends every 7500-10000 miles. That's a bit sketchy. Overall, I can't say that I recommend coming here.
Patrick Byrnes
★
☆☆☆☆
4 months ago
I am sorry I interrupted them, no cars in the shop when I arrived, had to look for anyone to assist me. Took 40 minutes to get everything done. My car sat there done for 15 minutes before I got anyone to check me out. During my Waite I got to see one of the staff having a tantrum over one of the employees cars parked over 2 spots, one of them being a handicap spot getting a ticket.
Michael Herron
★★
☆☆☆
Edited 3 weeks ago
Took almost an hour. Seen that my radio was adjusted to a station that I don’t have in my memory. When asked why it took so long they gave me the answer the boss was having a meeting. Been going to this store for several years but after today not sure I will return.
Pam McGuire
★★★★★
4 months ago
The service is always excellent. Treated with respect and courtesy.. They always take into account everyone is short on time; they are very efficient and timely..
Apache Mike
★★
☆☆☆
a year ago
You know as many vehicles that keep incoming and the up charge for the materials they supply, to see another conglomerate of a company especially established in "Big Oil" that they fill the need to do away with the free coffee/tea to their customers and save to line pockets for bigger bonuses and sell MORE product. This is the reason for the reviews rating not due to the service provided but by the decisions of the Brand. I'm forced to deal with this entity due to a fleet requirement for company employed by.
Michelle Kinstad
★★★★★
5 months ago
They were great and asked me what I was there for, didn’t try to upsale when I stated the air filter and cabin filter were being changed by a family member. Honored my coupon and found I was using a corporate one and found the one that was valid for their store.
Katie Grinstead
★★★★★
Edited 2 weeks ago
The staff are always very kind and knowledgeable. They are not pushy about recommended services, but they do inform you of your options. I’ve been going here for years for an oil and filter changes, and will continue.
German Tellez
★
☆☆☆☆
3 months ago
It’s almost been a year that I have a bad spoon with them. My truck is not working. Supposedly they do the claim and I haven’t received a response from the claim. I called to the claim members and then I haven’t have any response since almost a year they supposed to do the oil is not the first time it’s been happening to two different great monkeys so people please check your vehicle when you’re doing the oil change cause they don’t do anything
Rick Gonzalez
★★★★★
a month ago
Awesome service… Everyone was polite and friendly.. gave all the information I needed before any work was done. Fast service in and out
Adriana Andrade
★
☆☆☆☆
2 months ago
Very bad experience. When I arrived, I was greeted with a bad attitude. When I requested the service, they simply took my car without asking what type of service I needed. They went ahead and used the oil they chose without informing me, and it turned out to be the most expensive option.
Steve Pugh
★★★★★
2 months ago
I like dealing with Greasemonkey, but you need to make a printer friendly email reciept. I just need a single page reciept, not a three page version with color everything. Make it 1 page and black and white. Please don't waste my paper and color ink. What services did I get, I got an oil change, not listed as an option.
Chris Trimm
★★★★★
2 months ago
Red and the guys were all super nice and knowledgeable. They helped got the sludge out of my oil system, changed air filters and they even went the extra mile and removed a couple of empty cans and trash from my vehicle! I’m definitely going back to these gents.
Annie White
★★★★★
2 months ago
I had a great experience today at Grease Monkey. I was greeted quickly, and my car was taken back almost immediately for service. The manager went over recommendations for my vehicle and was very honest and fair with what needed to be done now, and what could wait. He also explained how they test each fluid, and in the end, even walked me out to my finished car and opened my door. Great, kind, fast service from start to finish. Thank you!
The Reubenite
★
☆☆☆☆
2 months ago
2012 BMW X5 XDrive35i : We brought the car here on 12/22/2025 for an oil change. About a week later we receive the critical "Low oil pressure" warning. I brought the vehicle back for reinspection and was told it may be a sensor issue even though the sensor was brand new. I ordered the adapter tool for the oil cap and a new oil filter and cap as I suspected they threw away the oil cap centerpiece with the old filter. When the items arrived, my suspicions were confirmed. The centerpiece was missing along with a gasket that controls oil flow into the engine. I inspected the filter for metal and luckily there was none. This could have resulted in catastrophic overheating and engine failure. NEVER AGAIN! I'll take responsibility for bringing the car there in the first place. If Grease Monkey employees are not familiar with European vehicles, they should refer customers to another shop. If you have a BMW or Mercedes, think long and hard before settling for Grease Monkey.
