my Toyota Highlander Third Generation (2014-2019) is leaking oil, what should I check?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

610 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 oil leaks in Toyota Highlander Third Generation (2014-2019). 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 opening any components to prevent burns.

Symptoms

•Oil spots or puddles under the vehicle
•Low oil level warning on the dashboard
•Engine oil smell while driving
•Visible oil stains on the engine or undercarriage
•Increased engine noise due to low oil levels

Diagnostic Steps

1
Inspect the oil level using the dipstick to determine how low the oil is.
2
Check the engine oil for color and consistency to identify contamination.
3
Examine the oil filter for signs of leaks or improper installation.
4
Inspect the oil pan and gasket for cracks or damage.
5
Look at the valve cover gasket for signs of oil seeping out.
6
Check the front and rear main seals for leaks.
7
Review the PCV (Positive Crankcase Ventilation) system for blockage 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

•Dipstick
•Funnel
•Oil filter wrench
•Drain pan
•Socket set
•Gasket scraper
•Seal puller

Parts Required

•Engine oil
•New oil filter
•New oil pan gasket
•New valve cover gasket
•New main seals (if necessary)

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Diagnostic Steps

1
Inspect the oil level using the dipstick to determine how low the oil is.
2
Check the engine oil for color and consistency to identify contamination.
3
Examine the oil filter for signs of leaks or improper installation.
4
Inspect the oil pan and gasket for cracks or damage.
5
Look at the valve cover gasket for signs of oil seeping out.
6
Check the front and rear main seals for leaks.
7
Review the PCV (Positive Crankcase Ventilation) system for blockage or malfunction.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to ensure safety.

2. Check and Top Up Oil Level

Tools Required: Dipstick, funnel, oil
Remove the dipstick, wipe it clean, reinsert, and check the oil level.
If low, add the appropriate oil type as specified in the owner’s manual.

3. Replace Oil Filter

Tools Required: Oil filter wrench, drain pan, new oil filter
Place the drain pan under the oil filter.
Remove the old oil filter using the wrench.
Apply a thin layer of oil to the rubber gasket of the new filter, then install it hand-tight.

4. Inspect and Replace Gaskets

Oil Pan Gasket

Tools Required: Socket set, gasket scraper, new oil pan gasket
Drain the engine oil completely by removing the oil drain plug.
Remove the oil pan by unbolting it carefully.
Clean the mating surfaces with a gasket scraper.
Install the new oil pan gasket and reattach the oil pan with the specified torque values.

Valve Cover Gasket

Tools Required: Socket set, new valve cover gasket
Remove components obstructing access to the valve cover.
Unbolt the valve cover and remove it.
Clean the surface and replace the old gasket with a new one.
Reattach the valve cover and torque to manufacturer specifications.

5. Replace Seals if Necessary

Tools Required: Socket set, seal puller, new seals
If oil is leaking from the front or rear main seals, remove the components blocking access.
Replace the affected seals with new ones, ensuring they are seated correctly.