Driving through Denver and its glorious Rocky Mountains is easy on the eyes, but it can be tough on cars. The Mile-High City’s extreme altitudes are to blame, as the decreased oxygen levels affect the way engines produce power. The harsh winters also play a part in complicating Denver car care; for example, experts recommend using a lightweight motor oil to prevent it from thickening in the chilly temperatures. But where is the best place to get a Denver oil change?

We’ve come up with a list of Denver auto-service spots that will keep your car running smoothly through the Rockies’ worst.

1. Grease Monkey

Why it’s great: Reliability. This Denver auto-care staple is in its 29th year of business and is helmed by an ASE–certified master technician.

Perks: No appointments necessary. And along with an oil change, the techs provide a 14-point inspection, vacuum interiors, and wash exterior windows.

Hours: 8 a.m.–6 p.m. Monday–Friday; 8 a.m.–5 p.m. Saturday.

2. Maple Garage

Why it’s great: In addition to oil changes, the techs service foreign and domestic vehicles with a slew of services including brake, alternator, and suspension repairs.

Perks: They schedule appointments online.

Hours: 8 a.m.–6 p.m. Monday–Friday.

3. Express Car Care

Why it’s great: The staff prides itself on being a family owned and operated shop and is known for going the extra mile with customer service.

Perks: As a quick lube facility, they guarantee no wait for an oil change. And while they’re working on your car, you can take advantage of TV and free WiFi.

Hours: 8 a.m.–5:30 p.m. Monday–Friday; 8 a.m.–4 p.m. Saturday.

4. Jiffy Lube

Why it’s great: With more than 2,000 locations across the United States, Jiffy Lube is a trusted franchise and it’s backed by ASE–certified technicians. They specialize in preventive maintenance, and offer a Signature Service Oil Change with an inspection and check, fill, and clean of essential components.

Perks: Unlike most Denver oil-change joints, Jiffy Lube is open on Sundays to cater to those who work during the week.

Hours: 8 a.m.–6 p.m. Monday–Friday; 8 a.m.–5 p.m. Saturday; and 9 a.m.–4 p.m. Sunday.

5. Mastermind Enterprises

Why it’s great: ASE–certified master technicians with more than 25 years of professional auto-repair experience do the dirty work here. Their glowing reviews provide testament to their claims of being an honest shop.

Perks: They provide a 12-month/12,000-mile warranty on all services and take care of regulars with a customer-referral bonus program.

Hours: 9 a.m.–6 p.m. Monday–Friday.