Oil Change Service StationAuto Air Conditioning ServiceAuto Maintenance
Grease Monkey, located on 8th Avenue, Garden City, offers a full-service 15-minute oil change to keep your vehicle in peak condition. Open Sundays for added convenience, we also provide AC recharge services. Located near the University of Northern Colorado and just minutes from Island Grove Regional Park, our shop is easily accessible for all your automotive needs.
Computer diagnostic scan identifies check engine light codes and engine issues. Our technicians explain what we found and provide clear estimates for recommended repairs—no guessing, no hard sell.
FLEET SERVICES
Commercial fleet maintenance programs with scheduled service, priority scheduling, and detailed reporting. Professional automotive care keeps your business vehicles running reliably and efficiently mile after mile.
FUEL INJECTOR CLEANING
Professional fuel system cleaning removes deposits from injectors, intake valves, and combustion chambers. Restores fuel efficiency, engine power, and smooth operation for better performance at the pump and on the road.
HIGH MILEAGE OIL CHANGE
High mileage oil change for vehicles over 75,000 miles uses specialized formula with seal conditioners and additives. Designed to reduce oil consumption, help prevent leaks, and protect aging engine components.
MULTIPOINT VEHICLE INSPECTION
Free 16-point inspection with every oil change covers fluids, brakes, tires, belts, hoses, battery, and filters. Complimentary check helps catch small issues before they become big, expensive problems.
OIL CHANGE SERVICES
Fast oil change with standard, synthetic blend, or full synthetic options done in under 15 minutes. Includes new filter, fluid top-off, and free 16-point inspection while you stay in your car.
TIRE PRESSURE CHECK
Complimentary tire pressure check with service includes adjustment to manufacturer specifications. Proper inflation improves fuel economy and extends the life of your tires.
TIRE ROTATION
Tire rotation service promotes even tread wear and extends tire life. Regular rotation based on your owner's manual—typically every 5,000-7,500 miles—maximizes your tire investment and maintains balanced handling.
TRANSMISSION SERVICES
Transmission fluid exchange removes and refills nearly 100% of fluid including the torque converter. Maintains smooth shifting and transmission performance while helping prevent slipping, hard shifts, and costly failures.
Reviews
4.6
707 reviews
5 stars
603
4 stars
41
3 stars
12
2 stars
14
1 star
37
JD
Jennifer Diaz-Leon
Oct 3, 2026
5.0
I came in close to the end of the day, and I was greeted by staff who were cheerful and working hard. It was super refreshing to see a team of people who were making the most of getting to do the work that they do! Their positive energy was contagious. Thank you for the great service!
MH
Mona Henson
Oct 3, 2026
2.0
I guess they got the job done…. Hopefully. Most expensive oil change I’ve ever had. I had to clean my steering wheel and gear shift when I got home because they were covered in oil. Didn’t realize the oil on the seat until my daughter was getting in that evening.
JH
Jeff Higdon
Sep 26, 2026
4.0
The employees who handled my truck were friendly and they seemed altogether good. The surprise of $171.00 dollars was not expected for an oil change. In google the average for my vehicle shows between 60.00 & 140.00
I had my receipt emailed to me and haven't looked at it yet. I felt like that was thirty to forty dollars more than what was showed to me on the deals available.
I could be wrong. I was just surprised
That said the crew working was great friendly and fast
VL
Victoria Luna
Sep 24, 2026
5.0
They did a great job, highly recommend going to Grease Monkey, Francis is a very polite and honest person.
AM
Al Meade
Aug 31, 2026
1.0
Ok.
However my experience at the Roy Utah location was a catastrophe. When I arrived at the Garden City location was to correct an issue with the front differential which was leaking after Roy UT was told only do the rear differential. I called Roy Utah a few days earlier and ask them if they touched my front differential, they said yes they checked the level in it and I said well I told you guys not to touch anything except for the rear and I said that the front of French was leaking so they told me to take it into a Grease Monkey in my location so I did and so they I asked him to also check my rear differential to make sure that they did the work on it like they said they were gonna and they replace the gasket because actually the O-ring, because they didn’t replace the O-ring in the front one when they opened it so when they opened it and they checked that, I said well let me take a look and see what kind of condition the rear differential Fluid is in, so they showed me The differential fluid in a cup it was black the Manager AT the Garden City location said that it looks like they may have only just topped off my rear differential and didn’t suck out the rear differential fluid that was in there previously so I had to pay an extra $227 to get my rear differential corrected because the magnet had about a quarter of an inch maybe half inch of sediment on it fine silver metal fragments and that’s because that differential fluid was cooked because they didn’t replace it. So what I want you guys to do is I want you guys to refund me my money for the service that was supposed to be given, but wasn’t in Roy Utah and you can contact me on the phone and talk to me too and explain why this stuff happened because it’s less than 32 days or something like that and there’s no reason in the world that that should’ve been that color in my truck .
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