Cadillac
ATS
Lexus
IS
Cadillac ATS vs Lexus IS: 2021 Comparison
The short answer
Based on available data, the Lexus IS comes out ahead of the Cadillac ATS on fuel economy and 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
ATS
Overall
Mixed sentiment with a clear divide between driving dynamics and reliability. The ATS is very frequently praised for its exceptional handling, steering feel, and chassis dynamics, with many owners and community feedback stating it was superior to contemporary BMW 3 Series models, particularly the F30 generation. The Alpha platform is consistently highlighted as a key strength, offering a rewarding and engaging driving experience.
Best version to buy
ATS-V: The high-performance variant is singled out for its exceptional performance, durable track-warrantied powertrain, and retention of the superb Alpha chassis dynamics. The 3.6L V6 engine (non-V) is also frequently recommended over the 2.0L turbo for its perceived greater reliability and smoother power delivery, despite being less fuel-efficient.
Known issues
- ⚠2.0L Turbo (LTG) engine failures: Catastrophic piston and piston ring failures, often around 50,000-100,000 miles (80,000-160,000 km), leading to misfires and requiring engine replacement.
- ⚠Chronic engine misfires: Recurring across multiple cylinders, often related to ignition coils, spark plugs, and fuel injectors, causing rough idle, stalling, and drivability issues. Frequency: very frequent.
- ⚠Cadillac User Experience (CUE) system failures: Touchscreen delamination/"shattering," system freezes, unresponsiveness, and complete unit failures. Very costly to replace out of warranty. Frequency: very frequent.
IS
Overall
Mixed sentiment heavily dependent on generation and powertrain. The IS is widely recognized for its strong long-term reliability, comfortable ride, and luxury feel, particularly when compared to German competitors. However, significant and recurring criticisms are directed at specific mechanical flaws, outdated powertrains, and poor fuel economy.
Best version to buy
IS 350 with the 2GR-FSE V6 engine is the most frequently recommended version for its superior power and reliability over the IS 250. For the third generation (3IS, 2014+), the 2015-2016 model years with the V6 and 6-speed automatic transmission are specifically highlighted to avoid the later UA80 transmission used in 2017+ models.
Known issues
- ⚠Carbon buildup on intake valves (IS 250 with 4GR-FSE engine): causes loss of power, rough idle, poor fuel economy, requires periodic cleaning. Frequency: very frequent.
- ⚠Water pump and front cover oil leaks (2GR-FSE V6 engine): common failure requiring expensive repair (engine removal for front cover, ~20-25 hours labor). Frequency: very frequent.
- ⚠Severe diesel engine issues (IS220d with 2AD-FHV engine): chronic DPF filter and EGR valve clogging leading to very high fuel consumption, potential for catastrophic engine failure (head gasket, seals) especially with poor maintenance.
The verdict
The Lexus IS is the better choice for most buyers.
It has stronger reliability sentiment in owner reports than the Cadillac ATS, based on the data above. If the specific known issues on the Lexus IS are a dealbreaker, the Cadillac ATS is worth a closer look instead.
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Frequently asked questions
Which is more reliable, the Cadillac ATS or the Lexus IS?
Owner reports lean more positive on reliability for the Lexus IS than the Cadillac ATS. See the known issues comparison above for the specific concerns owners report on each.
Which is better for families, the Cadillac ATS or the Lexus IS?
The Lexus IS seats more passengers than the Cadillac ATS on its catalogued best-equipped version. Body type also differs: the Cadillac ATS is classed as a Coupe, the Lexus IS as a Sedan.
Which has better fuel economy, the Cadillac ATS or the Lexus IS?
The Lexus IS is more fuel-efficient on paper: 11.8 L/100km combined versus 12.4 L/100km for the Cadillac ATS, based on the best-equipped catalogued version of each.
Which is cheaper to maintain, the Cadillac ATS or the Lexus IS?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Lexus IS than the Cadillac ATS. See the known issues comparison above.