Car Fluids: What to Check and How Often

Your vehicle depends on several fluids to function properly. At the shop, we too often see costly problems that could have been avoided with a simple regular check.

At the shop, we'll simplify it all for you. Here are the fluids to watch and when to check them.

1. Engine Oil

Role: lubricates, cools, and cleans the engine.

Frequency: check level monthly. Change per recommended intervals (5,000–12,000 km depending on oil type).

Problem sign: black/thick oil, dropping level, engine noise.

2. Coolant (Antifreeze)

Role: regulates engine temperature, prevents freezing and corrosion.

Frequency: check level each season. Replace every 3 to 5 years.

Problem sign: low level, cloudy color, sweet smell, high engine temp.

3. Brake Fluid

Role: transmits pressure from your pedal to the brakes.

Frequency: check level each season. Replace every 2 years.

Problem sign: spongy pedal, dark color, low level.

4. Transmission Fluid

Role: lubricates and cools the transmission.

Frequency: check per manual (often at 60,000–100,000 km).

Problem sign: hard shifting, burning smell, dark brown color.

5. Power Steering Fluid

Role: eases steering movement.

Frequency: check every 6 months.

Problem sign: stiff steering, squealing when turning the wheel.

6. Windshield Washer Fluid

Role: cleans the windshield.

Frequency: fill as needed. Use antifreeze product in winter (-40°C).

Key Takeaways

• Check engine oil and washer fluid monthly.
• Check other fluids each season or at tire changeover.
• A neglected fluid can cause costly repairs.
• In Montreal, extreme conditions wear fluids faster.
• Combine fluid checks with your regular maintenance.

Frequently Asked Questions

Can I mix different types of coolant?

Not recommended. Different types (green, orange, pink) have different chemical compositions that can react together.

How do I know which fluid to use?

Check the owner's manual or ask us. The right fluid depends on model and year.

Does brake fluid really deteriorate?

Yes, it absorbs moisture over time, reducing its boiling point and effectiveness.

Do I need to check transmission manually?

Many modern vehicles don't have an accessible transmission dipstick. Professional check recommended.

Is a leaking fluid always serious?

Every leak deserves attention. Some are minor, others can quickly become critical.

Garage Path57 · 7971 15e Avenue, Montréal (QC) H1Z 3N5 · (514) 433-7479