Compare two new cars by price, estimated monthly payment, fuel economy, and other specifications. Data comes from the CarPayCheck.com catalog and uses your selected financing terms.
| S5 | K4 | |
|---|---|---|
| Manufacturer | Audi | Kia |
| Starting price | — | — |
| Monthly payment | — | — |
| Fuel type | Gasoline | Gasoline |
| Fuel economy | 23.0 mpg | 30.0 mpg |
| CO₂ emissions | 386 g/mi | 267 g/mi–314 g/mi |
| Annual maintenance cost | — | — |
The EA839 3.0T V6 vacuum-actuated water pump internal seal can fail, allowing coolant to leak into the vacuum-control system on 2019-2024 Audi S5 models. The first symptom is typically a coolant-level warning, followed by coolant residue on switching valve N649; it may also trigger P0299 turbo under-boost and 'Drivetrain Malfunction' warnings, creating a risk of sudden power loss while driving. Audi issued TSBs MC-10245526-0001 and MC-10172894-0001 acknowledging the coolant pump leak issue.
Early-build 2025 Kia K4 sedans have reported instrument panel failures and inoperable power sunroofs, which appear to be electrical or assembly-quality defects rather than normal wear. These issues have not become a widespread recurring defect, and JD Power gave the 2025 and 2026 K4 models a reliability score of 86. The likely consequence is the need for dealer repair, typically covered under warranty, but no independent out-of-pocket cost estimate is available.
Fewer than 30 early-production 2025 Kia K4 vehicles were recalled for loose engine bolts, which can cause engine noise, vibration, oil leaks, or potentially engine damage. This is a safety compliance recall, so repairs are performed at no charge to the owner. Affected owners should contact a Kia dealer for inspection and repair.
Audi S5 and Kia K4 suit different driving needs. The main differences below cover price, monthly payment, fuel economy, and running costs.
Both models use Gasoline. Fuel economy is S5 — 23.0 mpg; K4 — 30.0 mpg. K4 uses less energy in everyday driving.
The final choice is about more than numbers: annual distance, city or highway use, and the space your household needs all matter. Use the CarPayCheck.com calculator to apply your financing terms and evaluate both cars in your situation.
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