why does my Toyota Highlander Third Generation (2014-2019) have a burning oil smell?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

579 words

Problem Statement

Learn how to diagnose and fix burning oil smell in Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, 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 systems.
•Allow the engine to cool completely before inspecting components to avoid burns.

Symptoms

•Burning oil smell inside or outside the vehicle
•Visible oil spots on the ground where the vehicle is parked
•Engine overheating or high temperature gauge readings
•Oil level lower than normal on the dipstick
•Engine smoke from the hood or exhaust

Diagnostic Steps

1
Check the engine oil level using the dipstick to see if it is low.
2
Inspect the engine bay for visible oil leaks or residue around seals and gaskets.
3
Examine the oil filter for signs of improper installation or leaks.
4
Look for signs of oil burning on exhaust components or the engine block.
5
Use an infrared thermometer to check for any hot spots on the engine.
6
Scan for any engine codes related to oil pressure or engine temperature.

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

•OBD-II scanner
•Oil filter wrench
•Torque wrench
•Infrared thermometer
•Shop towels
•Oil funnel

Parts Required

•Valve cover gasket
•Engine oil
•Oil filter

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Diagnostic Steps

1
Check the engine oil level using the dipstick to see if it is low.
2
Inspect the engine bay for visible oil leaks or residue around seals and gaskets.
3
Examine the oil filter for signs of improper installation or leaks.
4
Look for signs of oil burning on exhaust components or the engine block.
5
Use an infrared thermometer to check for any hot spots on the engine.
6
Scan for any engine codes related to oil pressure or engine temperature.

Solution

1. Preparation

Gather all necessary tools and materials.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery for safety.

2. Inspect and Clean

Inspect oil leaks:
- Visually examine the oil pan, valve cover gaskets, and oil filter.
- Clean any existing oil residue to help identify new leaks during testing.
Tools Required: Shop towels, flashlight.

3. Replace Gaskets and Seals (if needed)

Valve Cover Gasket Replacement:
- Remove any components obstructing access to the valve cover.
- Unscrew the valve cover bolts and carefully lift off the valve cover.
- Remove the old gasket and clean the mating surfaces.
- Install the new gasket and reassemble the valve cover, torquing bolts to manufacturer specifications (typically around 10-12 ft-lbs).
Oil Filter Replacement:
- Use an oil filter wrench to remove the old oil filter.
- Apply a small amount of new oil to the rubber gasket of the new filter and install it.
- Tighten by hand until snug (do not overtighten).

4. Top-Up Oil Level

If the oil level was low, top it off using the recommended oil type (e.g., 0W-20 synthetic oil).
Tools Required: Oil funnel, engine oil.

5. Test and Monitor

Reconnect the battery and start the engine.
Allow the engine to idle and check for any new leaks or burning smells.
Take the vehicle for a short drive to ensure everything is functioning correctly.