2018 Jaguar Xj
Vehicle Specs & Maintenance Data
The 2018 Jaguar Xj 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 Jaguar Xj.
For oil changes, the 2018 Jaguar Xj takes 5W-20 Full Synthetic motor oil with a capacity of 8.6 quarts. Brake fluid type is DOT 4, the recommended coolant is OAT Coolant (Orange), and transmission fluid is ZF Lifeguard 8 (ATF). Always use the manufacturer-recommended fluids to maintain warranty coverage and engine longevity.
When mounting wheels on the Jaguar Xj, torque the lug nuts to 92 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 Jaguar Xj have reported 5 common issues including "Air Suspension Strut and Compressor Failure", "Dual-View Infotainment Screen Failure" and "Supercharged V6 Coolant Pipe O-Ring Leaks". 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 2018 Jaguar Xj uses 5W-20 Full Synthetic motor oil (8.6 qt capacity), requires lug nuts torqued to 92 ft-lbs, takes DOT 4 brake fluid.
Manufacturer-recommended maintenance schedule for the 2018 Jaguar Xj. Always verify intervals against your owner's manual.
Enter a diagnostic trouble code to see causes, symptoms, and fixes for the 2018 Jaguar Xj.
Common problems reported by 2018 Jaguar Xj owners, with recommended fixes and estimated repair costs.
Air Suspension Strut and Compressor Failure
The XJ's standard air suspension system is prone to air strut bladder leaks and compressor burnout. The vehicle sags on one or more corners overnight, and a 'Suspension Fault — Reduced Speed' warning appears. The compressor runs excessively to compensate for leaking struts and eventually overheats and fails. This is one of the most common and expensive XJ repairs.
Replace the leaking air struts (test all four, as multiple typically fail around the same mileage). Replace the compressor and air dryer assembly simultaneously. Some owners opt to convert to conventional coil-over struts using aftermarket kits, which eliminates the recurring air suspension costs.
Est. Cost: $2,000 - $3,500 per strut / $1,500 - $2,500 (compressor) / $1,500 - $2,500 (coil-over conversion kit)Dual-View Infotainment Screen Failure
The XJ's unique dual-view 8-inch touchscreen (which shows different content to driver and passenger simultaneously) develops dead pixels, screen delamination, and touch input failure. The proprietary dual-view technology makes replacement parts expensive and limited in availability. Some screens develop a yellowish tint over time.
The infotainment display assembly must be replaced with an OEM unit, as aftermarket options are not available for the dual-view screen. Jaguar dealers can source refurbished units at a lower cost. A software update should be applied during replacement.
Est. Cost: $2,000 - $4,500Supercharged V6 Coolant Pipe O-Ring Leaks
The 3.0L supercharged V6 develops coolant leaks from the aluminum coolant pipe O-ring seals at the front of the engine, identical to the issue found across the Jaguar/Land Rover AJ126 engine family. Owners notice a coolant smell, low coolant warnings, and visible seepage from the front of the engine.
Replace the coolant pipe O-rings and reseal the connections. Access requires removal of the supercharger intake tract. Inspect the pipes for corrosion or pitting and replace if necessary. A pressure test of the cooling system after repair confirms no additional leaks.
Est. Cost: $500 - $1,500Electronic Parking Brake Actuator Failure
The electronic parking brake (EPB) fails to engage or release, displaying a 'Parking Brake Fault' message on the instrument cluster. The calipers' electric motors seize or the wiring harness to the rear calipers corrodes. In some cases, the parking brake will not release, preventing the vehicle from being driven.
The rear brake calipers with integrated electric parking brake motors must be replaced. The wiring harness should be inspected and repaired if corroded. After replacement, the EPB system must be calibrated using the dealer diagnostic tool. Both sides should be replaced together.
Est. Cost: $800 - $1,800 per sideBattery Drain and Electrical Module Wake-Up Issues
Multiple electronic modules fail to enter sleep mode, causing a parasitic draw that flattens the battery within 24-48 hours of parking. Common culprits include the telematics module, body control module, and the entertainment system. The XJ's extensive electronic architecture makes diagnosing the specific module time-consuming.
A dealer parasitic draw test with module-by-module isolation is required. The offending module receives a software update or replacement. The AGM battery must be replaced if it has been deeply discharged. Jaguar TSB JTB00367 provides a diagnostic flow for parasitic drain on the X351 platform.
Est. Cost: $200 - $500 (battery) / $500 - $2,500 (module diagnosis and replacement)