2015 Buick Regal
Vehicle Specs & Maintenance Data
The 2015 Buick Regal maintenance specs on this page cover the key fluids, torque values, and wear items you need for routine service. Use these numbers as a quick reference when performing oil changes, tire rotations, brake jobs, and other scheduled maintenance on your Buick Regal.
For oil changes, the 2015 Buick Regal takes 5W-30 Full Synthetic motor oil with a capacity of 5 quarts. Brake fluid type is DOT 3, the recommended coolant is Dex-Cool (OAT), and transmission fluid is Dexron VI. Always use the manufacturer-recommended fluids to maintain warranty coverage and engine longevity.
When mounting wheels on the Buick Regal, torque the lug nuts to 110 ft-lbs using a calibrated torque wrench. Over- or under-torquing can lead to warped brake rotors or loose wheels. Re-torque after 50 to 100 miles on newly installed wheels.
Owners of the 2015 Buick Regal have reported 5 common issues including "2.0L Turbo Timing Chain Stretch and Rattle", "Power Brake Booster Failure" and "Water Pump Failure and Coolant Leak". Scroll down to the Diagnostics tab for detailed descriptions, solutions, and estimated repair costs.
Specifications on this page are compiled from multiple publicly available sources including manufacturer documentation, NHTSA data, and automotive databases. Always cross-reference with your owner's manual or official factory documentation before purchasing parts or performing any service.
The 2015 Buick Regal uses 5W-30 Full Synthetic motor oil (5 qt capacity), requires lug nuts torqued to 110 ft-lbs, takes DOT 3 brake fluid.
Manufacturer-recommended maintenance schedule for the 2015 Buick Regal. Always verify intervals against your owner's manual.
Enter a diagnostic trouble code to see causes, symptoms, and fixes for the 2015 Buick Regal.
Common problems reported by 2015 Buick Regal owners, with recommended fixes and estimated repair costs.
2.0L Turbo Timing Chain Stretch and Rattle
The 2.0L LTG turbocharged four-cylinder engine develops timing chain stretch over time, causing a rattle on cold starts and eventually triggering check engine lights with timing correlation codes (P0016, P0017). The chain tensioner and guides wear prematurely, especially if oil change intervals are extended. Advanced stretch can cause rough running and misfires.
Replace the timing chain, tensioner, and guides as a complete set. The repair requires removal of the front timing cover and is moderately labor-intensive. Use the updated GM tensioner with improved oil passages. Maintain strict oil change intervals with full synthetic 5W-30 oil to prevent recurrence.
Est. Cost: $800 - $1,800Power Brake Booster Failure
The power brake booster loses vacuum assist, causing a hard and high brake pedal that requires significantly more foot pressure to stop the vehicle. Some owners report a hissing noise from the brake booster area and a noticeable increase in stopping distance. The issue can develop gradually or appear suddenly, creating a safety concern.
Replace the power brake booster and inspect the vacuum supply hose and check valve. Bleed the brake system after installation. If the brake master cylinder shows signs of internal bypass (spongy pedal), replace it at the same time. Inspect brake pads and rotors for uneven wear caused by reduced braking force.
Est. Cost: $400 - $900Water Pump Failure and Coolant Leak
The water pump on the 2.0L turbo engine leaks coolant from the weep hole or gasket surface, leading to low coolant levels and potential overheating. The pump bearing can also fail, creating a grinding noise from the front of the engine. This issue typically presents between 60,000 and 100,000 miles.
Replace the water pump, gasket, and thermostat. Flush the cooling system and refill with Dex-Cool coolant. Inspect the serpentine belt for coolant contamination and replace if necessary. Some owners upgrade to an aftermarket water pump with a metal impeller for improved durability.
Est. Cost: $400 - $800Front Strut Mount Bearing Noise and Clunking
The front strut mount bearings wear out and produce a creaking, popping, or clunking noise when turning the steering wheel, especially at low speeds in parking lots. The worn bearing allows the strut to bind during turning, causing the steering to feel notchy. The noise is most noticeable in cold weather and worsens over time.
Replace both front strut mount assemblies. Most technicians recommend replacing the complete strut assembly (strut, spring, mount, and bearing) to avoid the cost of spring compression. Perform a front-end alignment after replacement. Inspect the CV axle boots and tie rod ends at the same time.
Est. Cost: $400 - $900 for both sidesRear Trunk Release and Latch Failure
The trunk release actuator and latch mechanism fail, preventing the trunk from opening via the key fob button, interior release, or exterior trunk button. Owners are left unable to access the trunk unless they fold down the rear seats and climb into the trunk area to manually release the latch. The issue is often caused by a failed actuator motor or corroded wiring connector.
Replace the trunk latch and release actuator assembly. Inspect the wiring harness routing through the trunk hinge area for chafing or broken wires caused by repeated opening and closing. Apply dielectric grease to the connector to prevent future corrosion. The latch assembly is accessible from inside the trunk.
Est. Cost: $150 - $400