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2018 Buick Enclave Maintenance Schedule

Manufacturer-recommended service intervals for the GM Oil Life System and open recall alerts for your 2018 Buick Enclave.

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RecallsFull scheduleKnown issues6

How Buick schedules service: GM Oil Life System

Buick uses the GM Oil Life System: an algorithm tracks engine revolutions and temperature, then lights the change-oil message — typically every 7,500 miles in mixed driving, capped at 12 months, using dexos-approved oil. Current Encore GX and Envista run 1.2/1.3L turbo three-cylinders where oil quality matters more than volume drivers expect (the sump is small and turbo-heated). Front-drive models pair to a CVT with a published fluid interval — it is not a lifetime part.

Essential maintenance

Critical for safety and preventing major damage

🛢️

Engine Oil & Filter (Oil Life System)

Every 7,500 mi

Change when the Oil Life System calls it — typically around 7,500 miles, never beyond 12 months. dexos1 0W-20 on modern engines. Small-displacement turbos (Encore GX, Envista): don't stretch the indicator.

Estimated cost — typical U.S. ranges

Dealer

~$120–$160

Shop

~$85–$115

DIY

~$25–$55

Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.

🔄

Tire Rotation

Every 7,500 mi

Rotate every 7,500 miles with the oil change — GM pairs the two in its schedule.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Often free at the shop where you bought the tires — worth asking before paying.

🛑

Brake Inspection

Every 7,500 mi

Inspect pads, rotors, and lines at every service. Older Centurys: check rear drum adjustment and parking-brake cables, which seize with age.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.

⚙️

CVT Fluid (Encore GX / Envista FWD)

Every 45,000 mi

FWD Encore GX and Envista use a CVT: GM schedules fluid replacement around 45,000 miles under severe service — which includes most city commuting. AWD Encore GX uses a 9-speed automatic instead (see transmission fluid).

Estimated cost — typical U.S. ranges

Dealer

~$360–$500

Shop

~$255–$355

DIY

~$80–$180

CVT fluid is manufacturer-specific and pricey — do NOT substitute conventional ATF.

Important maintenance

Keeps your vehicle running smoothly and efficiently

⚙️

Automatic Transmission Fluid

Every 45,000 mi

Conventional automatics (Century's 4T65-E, Regal's Aisin, AWD Encore GX's 9-speed): GM lists 45,000 miles severe / longer normal. Older Buicks respond well to a simple drain-and-fill — avoid pressure flushes on high-mile units.

Estimated cost — typical U.S. ranges

Dealer

~$330–$500

Shop

~$235–$355

DIY

~$60–$180

Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.

⚡

Spark Plugs

Every 60,000 mi

Small-turbo three-cylinders (Encore GX, Envista): roughly every 60,000 miles — check the manual. Older 3.1/3.8 V6s: iridium plugs last to 100,000 miles.

Estimated cost — typical U.S. ranges

Dealer

~$285–$390

Shop

~$200–$275

DIY

~$25–$100

Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.

💨

Engine Air Filter

Every 45,000 mi

GM schedules replacement around 45,000 miles; inspect at every oil change in dusty regions.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

5-minute job on most cars; the airbox lid usually has clips, no tools needed.

🔗

Serpentine Belt

Every 60,000 mi

Inspect from 60,000 miles; replace on cracking or glazing rather than mileage alone.

Estimated cost — typical U.S. ranges

Dealer

~$195–$235

Shop

~$135–$165

DIY

~$20–$50

DIY-friendly if you can reach the tensioner. Inspect for cracks rather than swap on a strict mileage interval.

Recommended maintenance

Extends the life of your vehicle and improves comfort

🌬️

Cabin Air Filter

Every 22,500 mi

Replace roughly every 22,500 miles per GM's schedule — behind the glovebox on modern Buicks.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.

🌡️

Coolant Replacement (Dex-Cool)

Every 150,000 mi

Dex-Cool is rated 5 years / 150,000 miles. On older 3.1/3.8 V6s, intake-gasket seepage was the classic failure — check coolant level and condition at every oil change on a Century.

Estimated cost — typical U.S. ranges

Dealer

~$285–$330

Shop

~$200–$235

DIY

~$25–$60

Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.

🔋

Battery Test & Service

Every 25,000 mi

Test annually after year 3. Stop-start-equipped Encore GX/Envista use AGM batteries — replace like-for-like, not with a cheaper flooded battery.

Estimated cost — typical U.S. ranges

Dealer

~$225–$390

Shop

~$160–$280

DIY

~$130–$250

Most auto-parts stores test and install batteries free with purchase. Skip the dealer markup.

Known issues for this vehicle

What drivers and federal regulators have officially reported about the 2018 Buick Enclave.

Reported to NHTSA

Electronic parking brake self-engagement

SERVICE BRAKES

9 NHTSA complaints · 2018-12 → 2025-10

“Several times I have been stopped at a red light, and my parking break will come on without me engaging it. I was almost hit by other vehicles the last time my vehicle did this. People were blasting their horns and speeding around me because I was unable…”
— Owner report, NHTSA ODI #11695400
“WHILE DRIVING THE CAR THE ELECTRONIC PARKING BRAKE TURNED ON (WITHOUT THE DRIVER COMMANDING IT), STOPPING THE REAR WHEELS FROM ROTATING FREELY, MAKING IT VERY DIFFICULT TO DRIVE THE CAR. THE CAR WAS IN MOTION WHEN THIS HAPPENED. THIS HAS HAPPENED 3 TIMES…”
— Owner report, NHTSA ODI #11234221

Read all complaints on NHTSA →

Brake pedal non-response with ABS warning

SERVICE BRAKES

7 NHTSA complaints · 2018-02 → 2024-12

“THE BRAKE ISSUE RAISED ITS UGLY HEAD AGAIN. THE VEHICLE HAS OPERATED FINE SINCE THE ORIGINAL INCIDENT EVEN WITH THE FRONT-END DAMAGE. YESTERDAY, ONE WEEK AFTER THE ORIGINAL INCIDENT IT OCCURRED AGAIN. COLD START LEAVING A RESTAURANT TURNED OUT OF PARKING LOT…”
— Owner report, NHTSA ODI #11259038
“ON ONLY THE THIRD DAY AFTER PURCHASING A BUICK ENCLAVE AVENIR 2018 I HAD A SAFETY ISSUE INVOLVING THE BRAKES. WHEN APPLYING THE BRAKES A GRINDING NOISE WITH AN INABILITY TO PROPERLY BRAKE AND A RED SERVICE BRAKE ASSIST MESSAGE APPEARED ON MY DASH…”
— Owner report, NHTSA ODI #11072267

Read all complaints on NHTSA →

Transmission failure and loss of drive

POWER TRAIN

8 NHTSA complaints · 2019-12 → 2026-05

“After two transmission flushes and being told by a Buick dealership's service technicians that nothing is wrong with the vechile's transmission, it has now failed completely at ~90k miles.”
— Owner report, NHTSA ODI #11737422
“The contact owns a 2018 Buick Enclave. The contact stated while stopped at a gas station; after refueling the vehicle, the vehicle was restarted but was unable to shift to drive(D). The contact attempted to shift to reverse(R) and the shift lever failed to…”
— Owner report, NHTSA ODI #11706736

Read all complaints on NHTSA →

Shudder during acceleration

POWER TRAIN

3 NHTSA complaints · 2022-03 → 2025-05

“For 6 months I have had a shutter in the front part of my car. When I accelerate the car violently shakes. The car was under bumper Bumper warranty when this problem started. I have taken it to my dealer on multiple occasions and they and their engineers…”
— Owner report, NHTSA ODI #11456220
“My car starting sputtering on take off from stops, extremely dangerous if you’re trying to get out in traffic and keep up quickly from a stop. Then when I took it to get looked at it the mechanic said it needs a new transmission…”
— Owner report, NHTSA ODI #11608383

Read all complaints on NHTSA →

Engine stall at auto-stop restart

ENGINE

8 NHTSA complaints · 2018-09 → 2024-08

“2018 BUICK ENCLAVE. CONSUMER WRITES IN REGARD TO ENGINE SHUTING DOWN WHEN VEHICLE STOPS. *AS THE CONSUMER STATED THE START STOP FEATURE INTERMITTENTLY SHUTS DOWN THE ENGINE WHEN THE VEHICLE IS IDLE AND DOES NOT RECOVER QUICK ENOUGH FOR SAFE STARTS IN TRAFFIC. *JS”
— Owner report, NHTSA ODI #11142010
“The car has an auto-stop feature however at times, when the car is stopped, the entire electrical and engine shuts down even while the car is in drive. The driver must restart the car and put the car into park and then back into drive…”
— Owner report, NHTSA ODI #11440931

Read all complaints on NHTSA →

Catalytic converter and front exhaust pipe cracking

ENGINE AND ENGINE COOLING

4 NHTSA complaints · 2025-11 → 2026-06

“The contact owns a 2018 Buick Enclave. The contact stated that after picking up the vehicle from the dealer for a different failure, the exhaust pipe made an abnormally loud sound while driving. The check engine and other unknown warning lights were…”
— Owner report, NHTSA ODI #11700353
“Exhaust leak from broken front exhaust pipe. This has been a known defect in this make/model however the year of my vehicle was not included in the extended repair window and should have been. The exhaust leak was identified by the dealership when the…”
— Owner report, NHTSA ODI #11735792

Read all complaints on NHTSA →

Issues on other model years

  • 2015 Buick Enclave →
  • 2016 Buick Enclave →
  • 2017 Buick Enclave →
  • 2019 Buick Enclave →
  • 2020 Buick Enclave →
  • 2021 Buick Enclave →

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Jul 29, 2026. Investigation data refreshed Jul 29, 2026.

We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.

Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.

How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.

This maintenance schedule for the 2018 Buick Enclave reflects Buick's published service intervals and the GM Oil Life System system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.

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