2016 Tesla Model S Transmission Fluid & Service Spec

Quick Answer

• Transmission Make/Model: Single-speed fixed gear transmission with integrated drive unit.
• OEM Fluid Spec: Tesla Automatic Transmission Fluid P/N 1060934-00-A
• Drain & Fill Capacity: Approximately 1-1.5 liters per drive unit (front and/or rear).
• Full Overhaul Capacity: Approximately 1.5-2 liters per drive unit.
• Filter OEM Part Number: No serviceable external filter. Internal components are not typically user-serviceable.
• Recommended Service Interval: Not a routinely scheduled maintenance item. Fluid may be checked and topped off, or replaced if issues arise or during major repairs, typically at 100,000 to 150,000 miles or if unusual noise/leaks are present.

Fluid Type Explained

Unlike traditional internal combustion engine (ICE) vehicles that rely on multi-speed automatic or manual transmissions, the 2016 Tesla Model S utilizes a single-speed fixed gear reduction unit integrated into its electric drive units. There isn't a "transmission" in the conventional sense. Instead, these drive units contain reduction gears, bearings, and other components that require lubrication. The fluid used is a specialized automatic transmission fluid designed to withstand the high rotational speeds and unique thermal characteristics of an electric vehicle drivetrain.

The OEM fluid, Tesla Automatic Transmission Fluid P/N 1060934-00-A, is specifically formulated for optimal performance and longevity of the Tesla drive units. It provides excellent lubrication for gears and bearings, aids in heat dissipation, and helps prevent wear and corrosion. Using any fluid other than the specified Tesla fluid can lead to premature wear, increased noise, reduced efficiency, and potential damage to the drive unit, which can be very costly to repair or replace.

Service Procedure

Servicing the "transmission" fluid in a 2016 Tesla Model S is not a routine maintenance item for the average owner. Unlike traditional transmissions with readily accessible drain and fill plugs, the drive units are sealed units. Accessing the fluid typically requires specialized tools and knowledge, and often involves removing the drive unit from the vehicle. For this reason, fluid checks, top-offs, or replacements are usually performed by authorized Tesla service centers or highly experienced independent EV technicians.

There isn't a "drain and fill" procedure in the same sense as an ICE vehicle's transmission. If fluid service is required, it generally involves draining the old fluid and refilling with the new. A "full exchange" or "flush" is not a recommended or typical procedure for Tesla drive units due to their sealed nature and the specific design of the lubrication system. The listed capacities are approximations, and precise amounts should always be determined by a Tesla service manual or a professional technician during the service.

Service Interval

Tesla does not specify a routine maintenance interval for the drive unit fluid in the 2016 Model S. This is a significant departure from traditional vehicles where transmission fluid changes are a regular part of maintenance. The fluid is considered "lifetime" fill under normal operating conditions. However, "lifetime" does not necessarily mean "never needs service."

Factors that might necessitate a check or replacement of the drive unit fluid include:

• Unusual Noises: Whining, humming, or grinding sounds coming from the front or rear drive units could indicate an issue with the fluid or internal components.
• Leaks: Any visible fluid leaks around the drive unit housing should be addressed immediately.
• Major Repairs: If the drive unit is being serviced for other reasons (e.g., motor replacement, bearing issues), the fluid will typically be replaced as part of that repair.
• High Mileage: While not officially recommended, some owners and technicians may consider inspecting or replacing the fluid after exceptionally high mileage, such as 100,000 to 150,000 miles, especially if the vehicle has experienced prolonged periods of high-performance driving or towing (though towing capacity for the Model S is limited and not officially supported in all markets).

It's crucial to consult your owner's manual or a Tesla service center if you suspect any issues with your drive unit or its fluid.

Common Drive Unit Problems

While the Tesla drive units are generally robust, some issues have been reported over time, particularly in older Model S vehicles. These are not always directly related to the fluid but can sometimes be exacerbated by fluid degradation or low fluid levels.

• Whining or Humming Noises: This is one of the most frequently reported issues. It can originate from worn bearings within the drive unit or, less commonly, from issues with the gears themselves. Fluid degradation can sometimes contribute to increased noise.
• Fluid Leaks: Seals can degrade over time, leading to fluid leaks from the drive unit. If left unaddressed, fluid levels can drop, leading to lubrication starvation and significant damage.
• Drive Unit Failure: In rare cases, complete drive unit failure can occur, often preceded by unusual noises or a sudden loss of power. This can be due to a variety of factors, including bearing failure, motor issues, or, in extreme cases, internal gear damage.

It's important to note that Tesla has made continuous improvements to its drive unit designs over the years, and many of these issues are less common in newer vehicles. Regular software updates also play a role in optimizing drive unit performance and longevity.

If you experience any of these symptoms, it's imperative to have your vehicle inspected by a qualified Tesla technician as soon as possible to prevent further damage.

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