2021 Tesla Model 3 Fluid Spec Sheet

Quick Reference: 2021 Tesla Model 3 Fluid Capacities & Specs

Fluid	Type/Specification	Capacity
Engine Oil	N/A	N/A
Engine Coolant / Battery Coolant	G-48 HOAT (Blue)	~2.9 gal (11.0 L)
Transmission Fluid / Drive Unit Gear Oil	Tesla ATF-9	~1.5 - 2.2 qts (verify)
Brake Fluid	DOT 3	~1.0 qt (0.95 L)
Windshield Washer Fluid	Standard (Blue)	~1.0 gal (3.8 L)

A Master Technician's Guide to 2021 Tesla Model 3 Fluids

The Tesla Model 3, like all Battery Electric Vehicles (BEVs), represents a radical simplification in terms of required fluids and routine maintenance. With no internal combustion engine, a significant number of fluid-related services are eliminated entirely. However, several key fluids remain, and servicing them correctly is critical for the vehicle's long-term health, particularly for the battery and drive units.

This guide covers the essential factory-specified fluids for the 2021 Tesla Model 3.

Engine Oil

Not applicable. The Tesla Model 3 is a fully electric vehicle and does not have an internal combustion engine. Therefore, it does not require engine oil or oil changes.

Engine Coolant (Battery & Electronics Coolant)

• Specification: Tesla G-48 Coolant (Ethylene Glycol Hybrid Organic Acid Technology - HOAT)
• Color: Blue
• Capacity: Approximately 2.9 gallons (11.0 Liters) for the entire system.

Notes & Common Pitfalls: This is arguably the most critical fluid in a Model 3. It doesn't just cool the electronics and cabin heater; it is essential for maintaining the high-voltage battery pack within its optimal temperature range (both heating and cooling). Using the incorrect coolant can have catastrophic consequences for battery longevity and performance.

• Do Not Mix: Never mix with other coolant types or colors, such as standard OAT (Orange/Pink) or IAT (Green). Mixing can cause the coolant to gel, leading to blockages in the intricate cooling passages of the battery pack and electronics, resulting in expensive repairs.
• Service Interval: Tesla specifies a coolant replacement interval of every 4 years or 50,000 miles, whichever comes first. This is crucial for refreshing the anti-corrosion additives that protect the sensitive components of the thermal management system.
• Verification: This is a complex, high-voltage system that requires a specific vacuum-and-fill procedure to avoid air pockets. Service should only be performed by technicians trained in BEV systems.

Transmission Fluid (Drive Unit Gear Oil)

• Specification: Tesla specified Automatic Transmission Fluid (ATF). Often referred to as "Tesla ATF-9" or equivalent.
• Capacity: Varies by drive unit (rear-wheel drive vs. dual-motor). RWD units typically hold around 1.5 - 1.7 quarts, while larger units may hold up to 2.2 quarts. Verification with OEM service information is mandatory.

Notes & Common Pitfalls: Each drive unit (front and/or rear) in the Model 3 contains a reduction gearbox with its own fluid. This is not a traditional multi-gear transmission but a single-speed gearbox that requires a specific lubricant for its high-RPM electric motor.

• Never Use "Universal" ATF: Do not substitute with generic multi-vehicle ATF. The fluid required by the Tesla drive unit is formulated for specific frictional properties and cooling characteristics needed for a high-torque electric motor. Using the wrong fluid can lead to premature wear and failure of the drive unit.
• Service Interval: Tesla does not specify a routine replacement interval for the general consumer. However, many independent repair experts recommend a fluid change between 30,000 and 60,000 miles, especially for vehicles driven aggressively, to remove metallic wear particles and ensure longevity.

Front & Rear Differential Fluid

This is integrated with the drive unit. See "Transmission Fluid / Drive Unit Gear Oil" above. There are no separate front or rear differentials in the traditional sense; each motor has its own integrated gearbox and fluid.

Brake Fluid

• Specification: DOT 3
• Capacity: Approximately 1.0 quart (0.95 Liters) for a full system flush.

Notes & Common Pitfalls: The Model 3 uses a standard hydraulic braking system, but it gets much less use than in a conventional car due to regenerative braking. The electric motor handles the vast majority of deceleration, converting kinetic energy back into battery charge.

• Hygroscopic Nature: The primary reason for service is not wear, but moisture absorption. Brake fluid is hygroscopic, meaning it absorbs water from the atmosphere over time. This lowers the boiling point of the fluid, which can lead to a soft pedal or brake failure under heavy use. It also promotes internal corrosion of brake lines and components.
• Service Interval: Tesla recommends testing the brake fluid for moisture contamination every 2 years and replacing as necessary. A full flush and replacement every 2-3 years, regardless of mileage, is a best practice in the repair industry.
• DOT 4/5.1 Substitution: While DOT 4 and DOT 5.1 fluids have higher boiling points and are technically compatible in a DOT 3 system, it is always best to stick with the OEM-specified DOT 3 unless performing a full system upgrade for track use. Never mix with DOT 5 (silicone-based) fluid.

Power Steering Fluid

Not applicable. The Tesla Model 3 uses an Electric Power Assisted Steering (EPAS) system that does not require hydraulic fluid.

Windshield Washer Fluid

• Specification: Any standard blue, winter-rated windshield washer fluid.
• Capacity: Approximately 1.0 gallon (3.8 Liters).

Notes & Common Pitfalls: There are no special requirements here. Use a fluid rated for freezing temperatures in your climate to prevent damage to the reservoir, lines, and pump during winter months.

Diesel Exhaust Fluid (DEF)

Not applicable. This fluid is only for modern diesel engines to control NOx emissions.

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