The 2016 IS 300 uses a 3.5L V6 (2GR-FSE) with direct injection paired with an 8-speed automatic. Known for carbon buildup on intake valves and oil consumption issues that can escalate to catastrophic engine damage if ignored.
Excessive Oil Consumption Leading to Engine Failure
Common · high severityTypical onset: 60,000-120,000 mi
Symptoms: Low oil level warnings appearing between oil changes, Blue smoke on cold starts or acceleration, Eventual rod knock or complete engine seizure if oil runs critically low
Fix: 2GR-FSE engines burn oil due to piston ring design and bore glazing. If caught early, some owners try piston ring replacement (18-22 hours labor). Once rod bearings are damaged, you're looking at short block replacement or full rebuild (25-35 hours labor). Many shops quote engine replacement with a low-mileage used unit as more cost-effective.
Estimated cost: $6,500-12,000
Direct Injection Carbon Buildup on Intake Valves
Common · medium severityTypical onset: 70,000-100,000 mi
Symptoms: Rough idle and misfires, especially when cold, Loss of power and hesitation during acceleration, Check engine light with misfire codes (P0300-P0306)
Fix: Direct injection means no fuel washing over intake valves. Walnut blasting is the standard fix—intake manifold removal and media blasting each port (6-8 hours labor). Some techs combine this with spark plug and ignition coil replacement while they're in there.
Estimated cost: $800-1,400
Transmission Oil Cooler Line Leaks
Occasional · medium severityTypical onset: 80,000-130,000 mi
Symptoms: Transmission fluid spots under vehicle near front of engine, Low transmission fluid warnings on dash, Harsh shifts or slipping if fluid level drops significantly
Fix: The cooler lines and connections can corrode or crack where they meet the radiator. Replacement involves new lines and sometimes the external cooler assembly (3-5 hours labor). Always refill with Toyota WS fluid and verify no cross-contamination with coolant.
Estimated cost: $600-1,200
Transmission Mount Failure
Occasional · low severityTypical onset: 90,000-140,000 mi
Symptoms: Clunking or thudding when shifting from Park to Drive/Reverse, Excessive vibration at idle in Drive, Visible separation or tearing of rubber mount during inspection
Fix: The rear transmission mount absorbs drivetrain movement and degrades over time. Replacement is straightforward—support the transmission, unbolt old mount, install new OEM or aftermarket unit (1.5-2.5 hours labor).
Estimated cost: $300-550
Fuel System Contamination from In-Tank Filter Degradation
Rare · medium severitySymptoms: Hard starting or extended cranking, Rough running and power loss under load, Fuel pump whine or unusual noise from rear of vehicle
Fix: The in-tank fuel filter can break down internally and send debris through the system, clogging injectors. Requires fuel tank drop, pump assembly replacement, and often injector cleaning or replacement (6-10 hours labor depending on contamination severity).
Estimated cost: $1,200-2,500
Solid chassis and transmission, but the 2GR-FSE engine's oil consumption is a ticking time bomb—only buy if oil consumption history is documented as minimal and you're prepared for eventual carbon cleaning.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.