Alfa Romeo Stelvio Quadrifoglio 2.9 V6 949 Reliability: 70/100

Reliability Summary

Engine 2.9 V6 Biturbo (690T) — 70/100 ACCEPTABLE

Known Issues 5

2.9L TT V6

The Quadrifoglio's Ferrari-influenced 2.9 twin-turbo V6. No pattern of internal engine failures, but...

Issue	Engine	Severity	Onset
Auxiliary belt — overdue change can snap and wreck ancillaries or the engine	2.9 V6 Biturbo (690T)	high	58,000 km – 60,000 km
Fuel leak in the engine bay — Quadrifoglio built Nov 2020-May 2021 (recall)	2.9 V6 Biturbo (690T)	high	—
Coolant hose / clamp leak — overheating (recall)	2.9 V6 Biturbo (690T)	moderate	—
Turbo wastegate / overboost actuator seizure — power loss	2.9 V6 Biturbo (690T)	moderate	—
Fuel pump failure — low fuel pressure, loss of power (recall)	2.9 V6 Biturbo (690T)	moderate	—