Lexus GX 550
3.5L twin-turbo V6 — Toyota's replacement for the 1UR-FE and 3UR-FE V8 engines. The main bearing recall (machining debris from factory) affects 2022-2024 models across Tundra, LX, and GX 550. Approximately 127,000 vehicles recalled. Engine knocking, rough running, and complete failure documented at mileages as low as 5,000 miles. Toyota replaces engines under recall. Long-term reliability data still limited. The engine makes strong power but early production quality control was inadequate.
Twin-turbo V6 replaces the V8 — recall first, then judge
The GX 550 modernizes everything: twin-turbo V6, 10-speed automatic, new body, new interior. The V35A-FTS engine recall for machining debris and bearing failure affects 2024 models. Toyota is replacing engines under recall. If the recall is complete and the engine proves sound, the GX 550 is a significant upgrade. If not, the GX 460 with the proven 1UR-FE V8 is the safer used buy.
Engine Weaknesses 3
Machining debris left inside the engine during production accumulates on bearings and obstructs oil passages, causing bearing starvation and catastrophic engine failure. Toyota recalled approximately 127,000 vehicles (Tundra, LX 600, GX 550 from 2022-2024). Remedy is complete engine replacement at no charge. Failures documented at mileages as low as 5,000 miles.
Symptoms: Engine knocking, rough running, failure to start, check engine light, sudden power loss, complete engine seizure
Direct injection design allows oil vapors to deposit carbon on intake valves over time. The twin-turbo setup increases crankcase pressure which accelerates buildup. Walnut blasting is the standard remediation. Expected to become a maintenance item past 60,000-80,000 miles.
Symptoms: Reduced fuel efficiency, rough idle, engine misfire codes, hesitation on acceleration
The twin turbochargers can develop oil seal leaks over time from heat cycling and normal wear. Oil leaks into the exhaust side produce blue smoke; intake-side leaks cause oil consumption. The dual-turbo design doubles the potential failure points. Heat management is critical — short trips without full warm-up accelerate seal degradation.
Symptoms: Blue or white smoke from exhaust, oil consumption increase, burnt oil smell, oil residue near turbo housing
Vehicle Weaknesses 8
Machining debris from factory left in the engine block causes main bearing damage. Recall expanded to include 2024 GX 550. Approximately 127,000 vehicles affected across Toyota/Lexus models. Toyota replaces engines under recall at no charge. Symptoms include knocking, rough running, and complete engine failure at mileages as low as 5,000 miles.
First-year infotainment has typical software issues. Software updates expected to address over time.
New air suspension system may require recalibration after dealer service. Height sensors occasionally misread. First-year teething issue expected to improve with software updates.
As a completely new model, the 2024 GX 550 has typical first-year fit-and-finish variations. Panel gaps, trim alignment, and interior creaks are reported at higher rates than the proven GX 460.
Thin aluminum hood vibrates visibly above 25 mph. TSB L-SB-0013-25 with reinforcement clips.
Factory brake pads produce loud squealing in reverse from new. TSB L-SB-0036-24 covers replacement.
Driver-side mirror vibrates enough to impair rear visibility. Only driver side affected.
The V35A-FTS twin-turbo V6 is more powerful than the outgoing V8 but lacks the smooth, linear character. Some owners prefer the 1UR-FE V8 personality. Not a defect — a subjective character difference.