Checking the oil on your 2019 Mitsubishi Eclipse Cross and finding it low—again—raises concerns about engine health and maintenance costs. While all engines consume some oil, excessive consumption (typically defined as more than 1 quart per 1,000 miles) indicates a problem worth investigating. The Eclipse Cross's 1.5L turbocharged engine has specific characteristics that can contribute to oil consumption.
Symptoms of Excessive Oil Consumption
- Oil level low between changes despite no visible leaks
- Need to add oil frequently between services
- Blue smoke from exhaust, especially on startup or acceleration
- Burning oil smell
- Spark plug fouling
- Check engine light for misfire or catalyst codes
- Oil consumption exceeding 1 quart per 1,000 miles
Normal vs. Excessive Consumption
Mitsubishi, like many manufacturers, considers up to 1 quart per 1,000 miles "within specifications" for some engines, especially turbocharged ones. However, many owners find this level unacceptable. Consumption below 1 quart per 3,000 miles is generally considered good for turbocharged engines.
Common Causes in the 2019 Eclipse Cross
Turbocharger Seal Wear
Turbochargers spin at extremely high speeds and rely on seals to keep oil from entering the intake or exhaust. Worn seals allow oil to be consumed through the turbo.
Signs:
- Blue smoke on boost (acceleration)
- Oil in intercooler piping
- Turbo shaft play
Worn Piston Rings
Piston rings seal combustion and prevent oil from entering the combustion chamber. Worn rings allow oil past, where it burns.
Signs:
- Blue smoke on deceleration
- Low compression readings
- Oil on spark plugs
Valve Guide and Seal Wear
Valve guides and seals can wear, allowing oil to enter the combustion chamber past the valve stems.
Signs:
- Blue smoke on startup after sitting
- Smoke improves after warm-up
PCV System Problems
The Positive Crankcase Ventilation system recirculates crankcase vapors. Malfunctions can increase oil consumption or cause oil to be drawn into the intake.
Solutions:
- Check PCV valve operation
- Replace if stuck or clogged
Oil Type or Quality
Using incorrect oil viscosity or low-quality oil can increase consumption in some engines.
Solution: Use Mitsubishi-specified oil viscosity and quality synthetic oil.
Driving Habits
Frequent short trips, extended idling, or aggressive driving can increase oil consumption.
Solution: Occasional longer highway drives help maintain engine health.
Diagnosis Steps
- Measure consumption accurately: Check oil on level surface, same time in relation to running. Document usage over multiple fill-ups.
- Check for external leaks: Inspect under the vehicle and engine bay for oil spots.
- Check exhaust smoke: Blue smoke indicates oil burning
- Inspect spark plugs: Oil fouling indicates ring or valve seal issues
- Compression test: Low compression may indicate ring wear
- Leak-down test: Shows where compression is being lost
- Check turbo condition: Shaft play and oil in boost piping
Repair Costs
- PCV valve replacement: $50-$150
- Valve seal replacement: $500-$1,200
- Turbocharger replacement/rebuild: $1,500-$3,000
- Piston ring replacement: $2,000-$4,000
- Engine rebuild: $3,000-$6,000
Excessive oil consumption diagnosed as a manufacturer defect may be covered under warranty or extended via a Technical Service Bulletin. Document consumption carefully when discussing with the dealer.