2021 Tesla Model Y Fluid Type Specs

Quick reference

Fluid	Type/Spec	Capacity
Engine Oil	N/A (Electric Vehicle)	N/A
Engine Coolant	Glycol-based, Tesla-specific	Approximately 17L
Transmission Fluid	N/A (Single-speed/Reduction Gear Fluid)	1.8 - 2.0 L (per drive unit)
Transfer Case	N/A (AWD via sep. drive units)	N/A
Front Differential	Integrated with front drive unit (uses transmission fluid)	1.8 - 2.0 L
Rear Differential	Integrated with rear drive unit (uses transmission fluid)	1.8 - 2.0 L
Brake Fluid	DOT 4	Verify in service manual
Power Steering	N/A (Electric Power Steering)	N/A
Washer Fluid	Commercial Washer Fluid	Approx. 4.5 L
DEF	N/A (Electric Vehicle)	N/A

Engine Oil

The 2021 Tesla Model Y is an all-electric vehicle and, as such, does not require engine oil. There is no internal combustion engine present.

Engine Coolant

The 2021 Tesla Model Y utilizes a sophisticated liquid cooling system for its battery, motors, and power electronics. This system uses a specialized glycol-based coolant. Tesla specifies its own coolant formulation, and it is crucial to use only the genuine Tesla coolant or an approved equivalent that meets Tesla's specific requirements. Using an incorrect coolant can lead to corrosion, reduced cooling efficiency, and potential damage to the high-voltage components. The system has a substantial capacity, approximately 17 liters, due to the extensive cooling circuits throughout the vehicle.

Maintenance Intervals: Tesla generally recommends checking coolant levels during routine service appointments, typically every 2 years or 25,000 miles, whichever comes first. However, the coolant itself is designed for a long service life and often does not require replacement under normal circumstances unless there is a repair involving the cooling system.

Common Pitfalls: Never mix different types of coolants. Always use distilled water if topping off is absolutely necessary in an emergency, but it is best to use the specified coolant. Refer to your owner's manual or an authorized Tesla service center for precise topping-off procedures.

Transmission Fluid (Drive Unit Fluid)

The Tesla Model Y uses single-speed reduction gearboxes integrated with its electric drive units (front and rear). These units require a specific fluid for lubrication and cooling of the gears. While often referred to colloquially as "transmission fluid," it is more accurately a specialized reduction gear fluid. Tesla specifies its own proprietary fluid for these units. Each drive unit typically holds between 1.8 and 2.0 liters of this fluid.

Maintenance Intervals: Tesla's official maintenance schedule generally lists checking drive unit fluid levels as part of routine inspections. Fluid changes are not typically required for the life of the vehicle under normal driving conditions unless there's a repair to the drive unit or a leak.

Common Pitfalls: Do not use conventional automatic transmission fluid (ATF), manual transmission fluid (MTF), or standard gear oils in the Model Y's drive units. These fluids are not formulated for the specific demands of high-speed electric motor reduction gears and can lead to premature wear or damage.

Front and Rear Differential Fluid

On the 2021 Tesla Model Y, the front and rear differentials are integrated directly into their respective electric drive units. As such, they share the same specialized reduction gear fluid discussed in the "Transmission Fluid" section. There are no separate fluid reservoirs for traditional differentials.

Maintenance Intervals & Common Pitfalls: Refer to the "Transmission Fluid (Drive Unit Fluid)" section above. The same recommendations and warnings apply.

Brake Fluid

The 2021 Tesla Model Y utilizes DOT 4 brake fluid. This is a common glycol-ether-based brake fluid known for its high boiling point, which is critical for maintaining braking performance, especially during aggressive driving or under heavy loads. The specific capacity should be verified in your owner's manual or official Tesla service documentation, but it is typically a relatively small amount to fill the reservoir and lines.

Maintenance Intervals: Brake fluid is hygroscopic, meaning it absorbs moisture over time, which lowers its boiling point and can lead to corrosion in the brake system. Tesla generally recommends checking the brake fluid level and condition annually, and usually suggests replacement every 2 years or 25,000 miles, whichever comes first.

Common Pitfalls: Never mix DOT 4 fluid with DOT 5 (silicone-based) fluid, as this can lead to severe braking system damage. While DOT 3 and DOT 4 are compatible, it is always best to use the specified DOT 4 fluid to maintain optimal performance. Ensure the brake fluid reservoir cap is always secure to minimize moisture absorption.

Power Steering Fluid

The 2021 Tesla Model Y is equipped with an electronic power steering (EPS) system. This system does not use hydraulic fluid. Therefore, there is no power steering fluid to check or replace.

Washer Fluid

Any commercially available washer fluid designed for automotive use is suitable for the 2021 Tesla Model Y. Products that offer freeze protection are recommended, especially in colder climates. The washer fluid reservoir typically holds approximately 4.5 liters.

Maintenance Intervals: Top off as needed. It is good practice to use a washer fluid that also helps clean the windshield effectively, especially during insect seasons or heavy road grime.

Common Pitfalls: Do not use plain water, especially in freezing temperatures, as this can damage the washer fluid pump and lines. Avoid using household cleaners or dish soap, as they can leave streaks or damage the paint finish.

DEF (Diesel Exhaust Fluid)

The 2021 Tesla Model Y is an all-electric vehicle and does not have an internal combustion engine that produces nitrogen oxide (NOx) emissions. Therefore, it does not require Diesel Exhaust Fluid (DEF).

Find a trusted shop on Repairius.