2023 Tesla Model S Fluid Type Specifications & Capacities

As an ASE-certified master technician, I’ve seen the automotive industry undergo a massive shift over the last decade. The 2023 Tesla Model S—whether you are working on the Long Range Dual Motor or the tri-motor Plaid—is a marvel of electric vehicle (EV) engineering. However, just because it lacks a traditional internal combustion engine (ICE) doesn’t mean it’s completely free of fluids.

Electric vehicles still rely on specialized fluids for thermal management, gear lubrication, and traditional hydraulic braking. For the 2023 Model S (Palladium platform), understanding the exact factory-spec fluids is critical. Using off-the-shelf universal fluids in a high-voltage, high-performance EV can lead to catastrophic battery or drive unit failure.

Below is the complete fluid specification guide for the 2023 Tesla Model S, brought to you by Repairius.com.

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil	N/A (Fully Electric Vehicle)	N/A
Engine/Battery Coolant	Tesla HTF (G48 HOAT)	12.0 - 15.0 Quarts (approx, varies by trim)
Transmission/Drive Unit Fluid	Tesla EDF2 / Castrol BOT 113 (or DEXRON-VI equiv)	1.5 - 2.5 Quarts per drive unit
Transfer Case	N/A	N/A
Front & Rear Differential	Integrated into Drive Units (See above)	N/A
Brake Fluid	DOT 4 Brake Fluid	~1.0 Quart
Power Steering	N/A (Electronic Power Assist Steering)	N/A
Windshield Washer Fluid	Premium non-silicone washer fluid	~3.0 - 4.5 Quarts
DEF (Diesel Exhaust Fluid)	N/A	N/A

Note: Always verify exact capacities in the owner's manual or OEM service information, as Tesla frequently updates hardware during production runs.

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Thermal Management Coolant (Battery & Drive Unit)

The most critical fluid in your 2023 Tesla Model S is the thermal management coolant. Unlike a traditional internal combustion engine that only cools a block and heads, the Tesla coolant loop manages the high-voltage battery pack, the drive units (motors), and the power electronics.

Spec: Tesla HTF (Heat Transfer Fluid) / Ethylene-glycol based G48 (HOAT - Hybrid Organic Acid Technology). It is typically blue-green in color. Interval: Tesla states that the battery coolant does not need to be replaced for the life of the vehicle under normal circumstances. However, if the cooling system is opened for repairs (like a water pump, octovalve, or radiator replacement), it must be refilled and properly bled. Pitfalls: Never, under any circumstances, mix this with universal OAT (Organic Acid Technology) coolants, Dex-Cool, or standard green ethylene glycol. Mixing coolant types in a Tesla can cause the anti-corrosion inhibitors to drop out of suspension, clogging the microscopic cooling channels in the high-voltage battery pack. Bleeding the system requires Tesla’s Toolbox diagnostic software to run the pumps and purge air.

Drive Unit Fluid (Gearbox)

The 2023 Model S does not have a traditional multi-speed transmission, transfer case, or separate differentials. Instead, it utilizes Drive Units (two on the Long Range, three on the Plaid). Each drive unit houses a motor, an inverter, and a reduction gearset/differential combo.

Spec: Tesla specific synthetic fluid (EDF2 or Castrol BOT 113 / BOT 370 GL-4). Some older or specific drive units allowed for DEXRON-VI automatic transmission fluid, but for the 2023 Palladium models, always stick to the exact Tesla part number for the drive unit oil. Interval: Tesla considers drive unit fluid a "lifetime" fluid, generally meaning 100,000 to 120,000 miles. However, as an ASE technician, I highly recommend draining and filling the drive unit fluid every 50,000 miles to remove metallic break-in wear and maintain bearing life, especially if the vehicle is driven aggressively. Pitfalls: Do not use heavy gear oils like 75W-90 or 75W-140. The tight tolerances and high RPMs (over 20,000 RPM) of Tesla motors require a very thin, low-viscosity fluid to prevent parasitic drag and overheating. There are no Limited Slip Differential (LSD) friction modifiers needed, as traction is handled electronically.

Brake Fluid

Even with advanced regenerative braking doing most of the work to slow the vehicle down, the Model S still features a high-performance hydraulic brake system. In fact, because the mechanical brakes are used less frequently, the fluid is highly susceptible to moisture accumulation without getting hot enough to boil it off.

Spec: DOT 4 Brake Fluid. Interval: Tesla requires a brake fluid health check (testing for moisture content) every 2 years, and replacement if the moisture content exceeds 2-3%. Pitfalls: Do not use DOT 3. The extreme performance of the Model S requires the higher boiling point of DOT 4 (or DOT 5.1). Never use silicone-based DOT 5, as it will destroy the ABS module seals and is not miscible with DOT 4.

Windshield Washer Fluid

While it seems trivial, modern vehicles with advanced driver-assistance systems (ADAS) rely heavily on clean glass.

Spec: Standard premium windshield washer fluid. Interval: As needed. Pitfalls: Avoid washer fluids that contain silicone-based water repellents (like some Rain-X formulas). In Teslas, silicone additives can coat the fluid level sensor probes inside the reservoir, causing a persistent and annoying "Washer Fluid Low" warning on the infotainment screen even when the tank is full.

Fluids You Don't Need

To cover all our bases for technicians transitioning to EVs:

• Engine Oil: Non-existent. No API SP or dexos1 Gen 3 needed here.
• Power Steering Fluid: The Model S utilizes a fully Electronic Power Assist Steering (EPAS) rack. There are no hydraulic lines, pumps, or fluids.
• DEF (Diesel Exhaust Fluid): No diesel, no emissions, no API CK-4 or ISO 22241.

Electric vehicles require less frequent fluid maintenance, but the fluids they do use are incredibly specialized. When performing maintenance on a 2023 Tesla Model S, precision and strict adherence to OEM specs are non-negotiable.

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