Audi
A8
Cadillac
CT6
Audi A8 vs Cadillac CT6: 2024 Comparison
The short answer
Based on available data, the Cadillac CT6 comes out ahead of the Audi A8 on power. Check the specs table and owner sentiment below for the full comparison before deciding between the two. Both are covered by real owner reports on CarWizz.
Specs side by side
What owners say
A8
Overall
Sentiment is generally positive among long-term owners, particularly for the D5 generation (2018+), which is praised for its exceptional ride comfort, quiet cabin, advanced technology, and strong value proposition on the used market. The D5 is frequently described as a "hovercraft" for its sublime, non-floating air suspension and is noted for being significantly lighter than its rivals due to its aluminum construction, contributing to better handling and fuel economy. Owner satisfaction is often tied to purchasing the vehicle as a lightly used or CPO example at a steep discount from MSRP, where its blend of luxury, technology, and driving dynamics presents a compelling alternative to the Mercedes S-Class and BMW 7 Series.
Best version to buy
For the D5 generation (2018+), a well-optioned example is highly recommended. Key desired options include the Executive Package (22-way seats with ventilation/massage, head-up display), Driver Assistance Package (adaptive cruise with traffic jam assist), dual-pane acoustic glass, the premium lighting package (HD Matrix LED, OLED taillights), and the Bowers & Wilkins audio system.
Known issues
- ⚠High maintenance and repair costs: very expensive parts (e.g., air struts ~$2,200 each, headlights ~$3,000) and labor, leading to high annual ownership costs. Frequency: very frequent.
- ⚠Mild Hybrid System (Belt Starter Generator/BSG) failures: a known issue on D5 (2018+) models with the 48V system, potentially leading to expensive repairs; subject to a technical service campaign (27BQ). Frequency: recurrent.
- ⚠Electronic gremlins: concerns over long-term reliability of complex infotainment, driver aids, and other electronic systems; some isolated reports of issues requiring multiple resets. Frequency: recurrent.
CT6
Overall
Mixed sentiment with a clear divide between appreciation for the vehicle's core attributes and significant concerns over reliability and long-term viability. The CT6 is widely praised for its driving dynamics, particularly on the advanced Omega platform, which is noted for excellent handling and weight transfer. It is considered a cutting-edge luxury machine offering strong value, especially when purchased used, with powerful engine options (notably the 3.0L Twin-Turbo V6 and the rare 4.2L Twin-Turbo "Blackwing" V8) providing substantial performance.
Best version to buy
Insufficient owner data available to declare a consensus "best" trim. The high-performance CT6-V with the 4.2L Twin-Turbo V8 (Blackwing) is mentioned as a rare, fun halo car but is universally flagged for severe reliability concerns and future parts scarcity.
Known issues
- ⚠Unreliable electronics and poor build quality: electronics stop working randomly all over the car. Frequency: very frequent.
- ⚠Problematic 8-speed automatic transmission (8L45 and 8L90): harsh shifting, jerkiness, especially in 2nd gear, laggy response, subject to class action lawsuits. Frequency: very frequent.
- ⚠Severe engine cooling issues (CT6-V 4.2L Twin-Turbo V8): engines can burst into flames after hard driving, leading to parking outside as a precaution; described as a fundamental design flaw. Frequency: very frequent.
The verdict
The Cadillac CT6 is the better choice for most buyers.
It has more power on its best-equipped version than the Audi A8, based on the data above. If efficiency matters more to you than outright power, the Audi A8 is worth a closer look instead.
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Frequently asked questions
Which is more reliable, the Audi A8 or the Cadillac CT6?
Owner reports show similar reliability sentiment for the Audi A8 and the Cadillac CT6. Check the known issues listed above for specific differences between the two.
Which is better for families, the Audi A8 or the Cadillac CT6?
Data on family-specific factors like cargo space is limited for one or both models, but based on available reports, both are positioned as practical daily drivers. Check the specs table above for seating and body type.
Which has better fuel economy, the Audi A8 or the Cadillac CT6?
Fuel consumption data is limited for one or both models. Check the specs table above for the figures available on each catalogued version.
Which is cheaper to maintain, the Audi A8 or the Cadillac CT6?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Cadillac CT6 than the Audi A8. See the known issues comparison above.