The 2019 Infiniti QX50 introduced the revolutionary variable compression turbo (VC-Turbo) engine—and with any new technology, owners are learning what's normal and what indicates problems. Oil consumption between changes is a common concern. Understanding what's acceptable versus excessive helps determine whether your QX50 needs attention.
What's Normal for the VC-Turbo?
The VC-Turbo's unique multi-link mechanism and turbocharged operation can result in slightly higher oil consumption than some conventional engines. Infiniti considers up to 1 quart per 1,200 miles within acceptable parameters for this engine, though many owners report much lower consumption.
Signs of Excessive Consumption
- Needing to add oil more than once between changes
- Low oil warnings appearing on dash
- Blue smoke from exhaust, especially on startup or acceleration
- Oil smell from engine or exhaust
- Oil-fouled spark plugs
Potential Causes
Turbocharger Seal Wear
The turbocharger's shaft seals prevent oil from entering the intake or exhaust streams. Seal wear allows oil into combustion, creating consumption and potentially smoke.
PCV System Issues
The positive crankcase ventilation system manages crankcase pressure. Malfunctions can force oil past seals or draw excess oil vapor into intake.
Variable Compression Mechanism
The VC-Turbo's unique multi-link system operates in oil. While designed for tight tolerances, excessive wear could potentially affect oil consumption, though this is uncommon on properly maintained engines.
Piston Ring Concerns
Oil control rings manage oil film on cylinder walls. Issues here cause oil burning, though this is typically a higher-mileage concern.
Repair Costs
| Repair | Parts | Labor | Total |
|---|---|---|---|
| PCV valve replacement | $25-$75 | $75-$150 | $100-$225 |
| Turbo seal repair | $200-$400 | $600-$1,000 | $800-$1,400 |
| Turbocharger replacement | $1,200-$2,000 | $600-$1,000 | $1,800-$3,000 |
Monitoring and Documentation
Track oil level at each fill-up to establish consumption rate. This documentation is essential if warranty claims become necessary. Check oil on a level surface after the engine has sat for several minutes.