4.0 TDI V8 SQ7 vs 2.5 TFSI I5

Side-by-side reliability comparison

Higher reliability score
2.5 TFSI I5 BUY 83/100
+18 points over 4.0 TDI V8 SQ7
0 / 100
CAUTION 4.0 TDI V8 SQ7 Audi
0 / 100
BUY 2.5 TFSI I5 Audi

Specifications

4.0 TDI V8 SQ7
2.5 TFSI I5
Brand
Audi
Audi
Verdict
CAUTION
BUY
Reliability
65
83
Years
2016--present
2009--present
Displacement
3956 cc
2480 cc
Layout
V8
I5
Type
Diesel
Petrol Turbo
Power
435 hp
340--400 hp
Known Issues
1
2
Total Risk Cost
€800--€2,500
€700--€1,600

Character

4.0 TDI V8 SQ7

"SQ7/SQ8. Electric compressor + twin-turbo. Most complex diesel ever made. 48V system. EGR cooler. DPF/SCR. Phenomenal performance but any failure = very expensive."

2.5 TFSI I5

"Legendary 5-cyl. 9x Engine of the Year. Forged internals. Surprisingly reliable."

Issues Comparison

4.0 TDI V8 SQ7 1

▲ HIGH
EGR cooler failure €800--€2,500 60,000 km--120,000 km

2.5 TFSI I5 2

○ MINOR
Wastegate rattle (2015-2018 production) €300--€800 20,000 km--80,000 km
○ MINOR
Carbon buildup (DI engine) €400--€800 60,000 km--120,000 km

Models

4.0 TDI V8 SQ7 1

Q7 4M 2016--2020

2.5 TFSI I5 5

Ducato 250/290 2011--present TT 8J 2009--2014 Q3 8U 2013--2018 A3 8Y 2022--present TT RS 2.5 TFSI 8S 2016--2023 Coupe
Full 4.0 TDI V8 SQ7 Report Full 2.5 TFSI I5 Report