2018 Mazda Cx-9
Vehicle Specs & Maintenance Data
The 2018 Mazda Cx-9 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 Mazda Cx-9.
For oil changes, the 2018 Mazda Cx-9 takes 0W-20 Full Synthetic motor oil with a capacity of 4.8 quarts. Brake fluid type is DOT 3, the recommended coolant is FL22 Long Life Coolant (Green), and transmission fluid is Mazda ATF FZ. Always use the manufacturer-recommended fluids to maintain warranty coverage and engine longevity.
When mounting wheels on the Mazda Cx-9, torque the lug nuts to 80-108 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 2018 Mazda Cx-9 have reported 5 common issues including "Turbo Engine Cracked Cylinder Head", "Excessive Oil Consumption" and "Steering Column Noise and Looseness". Scroll down to the Diagnostics tab for detailed descriptions, solutions, and estimated repair costs.
There are 2 NHTSA safety recalls on file for the 2018 Mazda Cx-9. Check the Recalls tab below for full details.
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 2018 Mazda Cx-9 uses 0W-20 Full Synthetic motor oil (4.8 qt capacity), requires lug nuts torqued to 80-108 ft-lbs, takes DOT 3 brake fluid.
Manufacturer-recommended maintenance schedule for the 2018 Mazda Cx-9. Always verify intervals against your owner's manual.
Enter a diagnostic trouble code to see causes, symptoms, and fixes for the 2018 Mazda Cx-9.
Common problems reported by 2018 Mazda Cx-9 owners, with recommended fixes and estimated repair costs.
Turbo Engine Cracked Cylinder Head
The 2.5L turbocharged Skyactiv-G engine may develop cracks in the cylinder head at the exhaust manifold area. The turbo version fails more often because the additional stress from forced induction increases thermal load at the exhaust manifold junction.
Mazda issued a TSB (not a recall) addressing the cylinder head cracking issue. Cylinder head inspection and replacement is performed under warranty. Monitoring coolant levels between services can catch the issue early.
Est. Cost: $0 (warranty) / $2,000 - $4,500 if out of warrantyExcessive Oil Consumption
The 2.5L turbo engine may consume oil at a rate exceeding expectations, similar to the naturally aspirated Skyactiv engines. Low oil level warnings appear between service intervals, and the root cause is defective valve stem seals on the exhaust side.
Mazda TSBs acknowledge the oil consumption. Regular oil level checks between changes are recommended. Permanent fix is exhaust-side valve stem seal replacement. Mazda may cover the repair under warranty on a case-by-case basis.
Est. Cost: $0 (warranty) / $1,500 - $3,000 if out of warrantySteering Column Noise and Looseness
A creaking, knocking, rattle, or clunk noise emanates from the steering column while driving over irregular road surfaces. The steering column retaining nut loosens from vibration, causing perceptible play in the steering system.
A Mazda TSB addresses the steering column noise with retorquing of the column nut and application of thread-locking compound. Steering column shaft replacement may be needed if the nut area is worn or damaged.
Est. Cost: $100 - $400Front Brake Click and Squeak Noise
A click or squeak noise comes from the front brakes when first moving forward or reverse from a stop. The noise is most noticeable in cool or damp conditions and is caused by minor pad-to-rotor contact characteristics.
A Mazda TSB for 2016-2022 CX-9 addresses the front brake noise with cleaning and lubrication of brake caliper slides, application of anti-squeal compound to pad backs, and rotor surface refinishing if needed.
Est. Cost: $0 - $300Infotainment System Lag and Connectivity Issues
The Mazda Connect infotainment system responds slowly to inputs, loses Bluetooth connections, and has intermittent Apple CarPlay/Android Auto disconnections. The navigation system may also freeze during route calculation.
Update to the latest Mazda Connect firmware at the dealer. A factory reset of the infotainment system and re-pairing all devices can improve performance. The CMU (Connectivity Master Unit) may need replacement in persistent cases.
Est. Cost: $0 - $8002 NHTSA safety recalls for the 2018 Mazda Cx-9. Check your VIN at NHTSA.gov
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
Mazda North American Operations (Mazda) is recalling certain 2018 Mazda3, Mazda6, 2019 CX-3, 2018-2019 MX-5, CX-5, CX-9, and 2019-2020 Mazda2 vehicles. The impeller inside the low-pressure fuel pump may crack and deform, potentially causing the fuel pump to fail.
Fuel pump failure may cause an engine stall, increasing the risk of a crash.
Dealers will replace the fuel pumps, free of charge. Owner notification letters were mailed July 18, 2022. Owners may contact Mazda customer service at 1-800-222-5500 Option 4. Mazda's number for this recall is 5321K.
ELECTRICAL SYSTEM:WIRING
Mazda North American Operations (Mazda) is recalling certain 2018 CX-9 vehicles. The wiring harness may disrupt electrical communications and disable the passenger frontal air bag, turn signals, and/or engine starting system.
The passenger frontal air bag may not deploy, increasing the risk of injury. Inoperable turn signals prevent the driver from signaling to other drivers, increasing the risk of crash.
Mazda will notify owners, and dealers will repair the wiring harnesses, free of charge. The recall began July 26, 2019. Owners may contact Mazda customer service at 1-800-222-5500, Option 4. Mazda's number for this recall is 3419E.