why is my Toyota Highlander using too much oil lately

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

548 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix excessive oil consumption in Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine to cool before performing any work to avoid burns.

Symptoms

•Oil level depletes quickly between oil changes
•Blue smoke from the exhaust
•Engine knocking or ticking noises
•Unusual engine performance or rough idling
•Increased emissions during operation
•Oil leaks visible under the vehicle

Diagnostic Steps

1
Check the oil level and condition using a dipstick.
2
Inspect for visible oil leaks around the engine and oil pan.
3
Conduct a compression test on each cylinder to assess engine health.
4
Perform a leak-down test to identify potential sealing issues.
5
Scan the vehicle’s onboard diagnostics for any related trouble codes.
6
Inspect the PCV (Positive Crankcase Ventilation) valve for blockages or malfunction.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Socket set
•Torque wrench
•Pliers
•Gasket scraper
•OBD-II scanner

Parts Required

•PCV valve
•Replacement gaskets (valve cover, oil pan)
•Engine rebuild kit (if necessary)

Related Faults

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Diagnostic Steps

1
Check the oil level and condition using a dipstick.
2
Inspect for visible oil leaks around the engine and oil pan.
3
Conduct a compression test on each cylinder to assess engine health.
4
Perform a leak-down test to identify potential sealing issues.
5
Scan the vehicle’s onboard diagnostics for any related trouble codes.
6
Inspect the PCV (Positive Crankcase Ventilation) valve for blockages or malfunction.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace the PCV Valve

Tools Required: Socket set, pliers, replacement PCV valve.
Remove the old PCV valve by unclipping or unscrewing it from the valve cover.
Inspect the valve cover grommet for wear and replace if necessary.
Install the new PCV valve, ensuring it is seated correctly and secured.

3. Address Engine Seals and Gaskets

Tools Required: Socket set, torque wrench, gasket scraper, replacement gaskets.
Identify and replace worn engine gaskets (e.g., valve cover gasket, oil pan gasket) that may be causing leaks.
To replace the valve cover gasket:
- Remove the valve cover by unscrewing the bolts.
- Clean the mating surfaces thoroughly with a gasket scraper.
- Install the new gasket, ensuring proper alignment.
- Reinstall the valve cover and torque the bolts to the manufacturer’s specifications.

4. Engine Rebuilding (if necessary)

If compression or leak-down tests indicate serious internal issues, consider overhauling the engine.
Tools Required: Complete engine rebuild kit, engine hoist, torque wrench, various hand tools.
Disassemble the engine as per service manual instructions.
Replace worn piston rings, bearings, and seals as necessary.
Reassemble the engine with new gaskets and follow torque specifications for all components.