2017 Tesla Model S: Fluid Specifications

As an all-electric vehicle, the 2017 Tesla Model S has a much simpler maintenance schedule than its internal combustion engine (ICE) counterparts. However, it still relies on several critical fluids to keep its advanced systems operating at peak performance. This guide covers all the factory-specified fluids for your 2017 Model S.

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil	N/A	N/A
Engine Coolant / Battery Coolant	G-48 ethylene glycol (blue)	~11.0 L (2.9 gal)
Drive Unit (Transmission/Differential)	ATF, Tesla specification	~1.5 L per unit
Brake Fluid	DOT 4	~1.0 L (1.06 qt)
Power Steering Fluid	N/A (Electric Power Steering)	N/A
Windshield Washer Fluid	Standard, freeze-resistant	~3.2 L (3.4 qt)
Diesel Exhaust Fluid (DEF)	N/A	N/A

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Engine Oil

The 2017 Tesla Model S is a fully electric vehicle and does not have an internal combustion engine. Therefore, it does not require engine oil, oil filters, or the routine oil changes associated with gasoline or diesel cars.

Engine Coolant / Battery Coolant

The most critical fluid in a Model S is the coolant, which serves the entire thermal management system. This includes the high-voltage battery, the drive unit(s), and the cabin heater. Using the correct coolant is essential for battery longevity and performance.

• Specification: Tesla G-48 Ethylene Glycol Coolant (Blue)
• Interval: Tesla recommends a complete coolant system flush and replacement every 4 years or 50,000 miles (80,000 km).
• Notes: The factory coolant is a specific HOAT (Hybrid Organic Acid Technology) formula, often blue in color. It is critical not to mix it with other coolant types (like standard green or orange OAT coolants), as this can cause gelling and severely damage the battery and powertrain components. Do not use "universal" coolants. Always use the specified G-48 coolant or a compatible equivalent explicitly designed for Tesla vehicles.

Drive Unit Fluid

The drive unit in a Model S, which combines the motor, inverter, and gearbox, functions as both the transmission and differential. Each drive unit (one for RWD models, two for AWD models) has its own internal fluid supply.

• Specification: Automatic Transmission Fluid (ATF). Tesla does not publish a universal cross-compatible spec number (like Dexron or Mercon), so sourcing the fluid directly from Tesla or a trusted EV service specialist is highly recommended. The original factory fill is often reported to be Pentosin ATF-9.
• Interval: Tesla considers this a "lifetime" fluid. However, many independent repair experts recommend a fluid change at intervals between 50,000 and 100,000 miles to ensure maximum drive unit longevity, especially in high-performance or high-mileage vehicles.
• Notes: This is not a typical DIY service. The fill and drain plugs can be difficult to access, and the fill level is critical. Overfilling or underfilling can lead to damage. This service is best left to technicians experienced with Tesla vehicles.

Brake Fluid

Like all modern vehicles, the Model S uses hydraulic brake fluid. Due to the nature of regenerative braking, the conventional hydraulic brakes are used less frequently, but the fluid still requires regular service.

• Specification: DOT 4
• Interval: Tesla recommends testing the brake fluid for moisture content every 2 years and replacing it as needed. Brake fluid is hygroscopic, meaning it absorbs moisture from the air, which lowers its boiling point and can corrode internal brake components.
• Notes: Do not use DOT 3 or DOT 5 (silicone-based) fluid. Stick with a quality DOT 4 fluid from a sealed container to ensure purity. A complete flush is essential to remove all old, moisture-contaminated fluid from the lines and calipers.

Power Steering Fluid

The 2017 Tesla Model S is equipped with electric power-assisted steering (EPAS). The system uses an electric motor to provide steering assistance instead of a hydraulic pump and fluid. Therefore, there is no power steering fluid to service.

Windshield Washer Fluid

This is the most straightforward fluid on the vehicle.

• Specification: Any standard, commercially available windshield washer fluid.
• Notes: Use a fluid rated for freeze protection in colder climates to prevent the reservoir and lines from freezing and cracking. Some owners prefer to use de-ionized water mixed with a concentrated washer solution to prevent mineral deposits on paint and glass.

Diesel Exhaust Fluid (DEF)

The 2017 Tesla Model S is a battery-electric vehicle and does not have a diesel engine. It does not require Diesel Exhaust Fluid (DEF).

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