What are the most common problems with the 2018 Audi A8?

The primary ownership concern is a critical recall for fuel leaks from the fuel rails, which requires verification of repair.

How many recalls does the 2018 Audi A8 have?

The 2018 Audi A8 currently has 2 recalls on file. Review the full recall report to see affected components and available remedies.

Is the 2018 Audi A8 a good buy used?

Verdict: Proceed with caution. The primary ownership concern is a critical recall for fuel leaks from the fuel rails, which requires verification of repair. A high volume of Technical Service Bulletins (TSBs) suggests potential for various non-critical but owner-impacting issues. Despite zero owner complaints logged with NHTSA, the vehicle's 'Average' reliability verdict warrants careful inspection. The 4.0L V8 engine, all-wheel drive, and automatic transmission are generally robust, but TSBs may point to complex electronic or mechanical systems. Confirm completion of the recall addressing a potential loosening engine compartment seal. Always verify service history, open recalls, and maintenance records before purchasing.

What maintenance costs should I expect for the 2018 Audi A8?

Refer to the maintenance cost guide for interval schedules, DIY difficulty ratings, and typical repair cost ranges for the 2018 Audi A8.

2018 Audi A8 Report

Known issues, recalls, running costs, and what to check before you buy.

Updated Jun 2, 2026Ryan Davis1 Critical Recall

Overall Score

Our Verdict

Proceed with caution

Key Takeaways

The primary ownership concern is a critical recall for fuel leaks from the fuel rails, which requires verification of repair.
A high volume of Technical Service Bulletins (TSBs) suggests potential for various non-critical but owner-impacting issues.
Despite zero owner complaints logged with NHTSA, the vehicle's 'Average' reliability verdict warrants careful inspection.
The 4.0L V8 engine, all-wheel drive, and automatic transmission are generally robust, but TSBs may point to complex electronic or mechanical systems.

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Overview

2018 Audi A8

The 2018 Audi A8 is a full-size luxury sedan that blends sophisticated design with potent performance. Under the hood, it features an 8-cylinder, 4.0-liter engine paired with an 8-speed automatic transmission and Audi's renowned all-wheel-drive system. This combination delivers robust power, with horsepower ranging from 333 to 450 hp and torque from 325 to 444 lb-ft. Fuel economy is rated at 19 MPG combined. However, potential buyers should be aware of its 'Average' reliability rating, underscored by two recalls, including a critical one for fuel leaks, and a significant number of Technical Service Bulletins (TSBs).

Critical Failure Risk

A critical recall addresses potential fuel leaks from the fuel rails, posing a fire hazard. This indicates a potential systemic issue with the fuel delivery system's integrity.

Early detection can help you avoid a $800-$1,500 repair.

Open Maintenance Analysis →

Safety & Bulletins

Open Recalls2

Service Bulletins0

Full Recall History →

Owner Complaints

No primary complaint themes found.

Detailed Issue Breakdown →

Performance & Efficiency

Horsepower: 333–450HP
Torque: 325–444 lb–ftLB-FT

Fuel Efficiency

Combined

MPG

City

MPG

Highway

MPG

Full Vehicle Specifications ↓

Reliability

Practicality

The score is mainly limited by high fuel consumption.

Buyer Fit

Who This Car Is For

Best for

Discerning buyers prioritizing luxury, technology, and performance over absolute long-term reliability.

+2 more buyer-fit notes in the full report

Avoid if

Buyers seeking a low-maintenance, worry-free vehicle with a proven track record of exceptional reliability.

+2 more buyer-fit warnings in the full report

2018 Audi A8 Reliability Analysis

Specs

Vehicle Specs

Fuel Type: Premium
Seating Capacity: 5
Horsepower: 333-450 hp
Torque: 325-444 lb-ft
Transmission: Automatic (S8)
Drivetrain: All-Wheel Drive
Body Style: Sedan
MSRP Range: $82,500 - $92,000
EPA Combined MPG: 19

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Most Common Issues

1. Fuel Rail Leaks

Most reported

Usage data observed

2. Engine Compartment Seal Loosening

Usage data observed

See all common issues in the maintenance guide

First Service Interval

- Oil Change (5W-40 Synthetic) (Parts: 5W-40 Synthetic Oil, Oil Filter) - Tire Rotation and Inspection - Brake System Inspection

Est. shop cost: $150 - $250

10,000 mi

Unlock the full maintenance guide for every scheduled service interval and cost forecast.

Full pre-purchase inspection checklist

Complete maintenance schedule (4 service intervals)

Repair forecasts with mileage and cost context

Full buyer-fit guidance and who should avoid it

Full specs and trim-level context

2 recall campaign details & remedy notes

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FAQ

Is the 2018 Audi A8 reliable?

The CarFocal Reliability Score for the 2018 Audi A8 is 8.4/10. Reliability score is 8.4/10. NHTSA recalls: 2. Owner complaints: 0.

How practical is the 2018 Audi A8 for daily use?

Practicality score is 4.6/10. The score is mainly limited by high fuel consumption. EPA combined economy is 19 MPG. Seating capacity is 5. 4 passenger doors are listed. Boot capacity is 390 litres.

What is the overall score for the 2018 Audi A8?

The CarFocal Overall Score for the 2018 Audi A8 is 6.2/10. Overall score is 6.2/10 (Mixed). Confidence 55%. Maintenance 8.3/10. Practicality 4.6/10.

What does it cost to own and maintain a 2018 Audi A8?

Based on Carfocal's data, First listed service: - Oil Change (5W-40 Synthetic) (Parts: 5W-40 Synthetic Oil, Oil Filter) - Tire Rotation and Inspection - Brake System Inspection at 10,000 miles. Estimated first-year maintenance: $500 - $800. Repair prediction highlight: Fuel Rails (typical at 50,000 miles, estimated cost Min: $800 • Max: $1,500).

What is the MSRP range for the 2018 Audi A8?

MSRP range is $82,500 - $92,000.

What engine is in the 2018 Audi A8?

Engine specs list V6, V8 • 8 • 4.0. Output is 333-450 hp • 325-444 lb-ft.

What transmission does the 2018 Audi A8 use?

According to CarFocal's specs for the 2018 Audi A8, transmission is Automatic (S8). The paired drivetrain is All-Wheel Drive.

Does the 2018 A8 require Premium gas?

Manufacturer fuel recommendation: Premium.

What is the combined EPA MPG for the 2018 Audi A8?

EPA combined estimate is 19 MPG.

What driver assistance and safety features are available on the 2018 Audi A8?

1 standard driver assistance features. Key features include Tire Pressure Monitoring System.

What is the fuel economy range for the 2018 Audi A8?

According to CarFocal's specs for the 2018 Audi A8, fuel economy range is 16-22 mpg combined.

How many people fit in a 2018 Audi A8?

According to CarFocal's specs for the 2018 Audi A8, seating capacity is 5.

What body style is the 2018 Audi A8?

According to CarFocal's specs for the 2018 Audi A8, body style is sedan.

What drivetrain does the 2018 Audi A8 use?

According to CarFocal's specs for the 2018 Audi A8, drivetrain is All-Wheel Drive. Transmission is Automatic (S8).

Are there open safety recalls on the 2018 Audi A8?

This model year has 2 official safety campaigns listed.

Should buyers consider alternatives to the 2018 Audi A8?

Alternatives listed in this guide: 2018 Mercedes-Benz S-Class and 2018 Porsche Panamera.