22/01/2022
Maintaining your 2013 GTR involves regular fluid changes, a task that, while requiring some mechanical aptitude, is certainly achievable for the dedicated owner. This guide, drawing from the Factory Service Manual (FSM), will walk you through the process of changing your transmission and differential fluids. We'll cover everything from identifying the correct fluid specifications to the intricate steps involved in ensuring your GTR's driveline remains in peak condition. While the FSM recommends changes every 36,000 miles, track use with temperatures between 248-284F necessitates changes every 3,000 miles, with immediate changes required above 284F.
Front Differential Fluid Change
The front differential fluid change is a relatively straightforward procedure. You'll need a 10mm hex tool and two new crush washers for the fill and drain plugs, which are conveniently located near the engine oil filter. Accessing the front differential requires removing the front lower panel.
Locating the Plugs
Once the front lower panel is removed, you'll find the fill and drain plugs. The top bolt is for filling, and the bottom bolt is for draining. Be aware that the fill bolt can be a bit fiddly to access, so having a wobble joint and extensions for your socket set will be invaluable. Screw the fill bolt in by hand initially, using a small extension for better grip, before tightening it with the wobble joint. The torque specification for both the fill and drain plugs is 25 lb-ft.
Fluid Capacity and Type
The front differential requires approximately 0.7 litres of fluid. It's often recommended to fill until the fluid begins to overflow from the fill hole. Interestingly, you can often source this fluid from Mercedes-Benz at a significantly lower price than from Nissan, potentially saving you a considerable amount. You'll need a total of 2 litres for both the front and rear differentials.
Rear Differential Fluid Change
The rear differential fluid change involves a few more steps, primarily due to the need to access and remove a small heat shield. Again, a 10mm hex tool will be required for most of the bolts, with some 12mm bolts also present.
Accessing the Rear Differential
Begin by removing the rear-most diffuser panel. Keep the removed bolts organised, as there are numerous 10mm and 12mm fasteners. Take care not to damage the carbon fibre panel during removal. You'll need to remove the front portion of the rear diffuser as well, again, keeping your bolts organised. The drain and fill plugs are located on the rear differential housing. The fill bolt is centrally located, but you'll need to remove a small aluminium heat shield, secured by four 10mm bolts, to gain access to it. A hand pump is essential for refilling the differential with fluid.
Drain Plug and Tube
A crucial step when draining the rear differential is to remove the internal drain tube. This tube, secured by a 4mm hex bolt, also acts as a fluid level indicator. Once both the drain tube and the drain plug are removed, approximately 7 litres of old fluid will drain out. The stock fluid is typically blue, but aftermarket fluids may vary in colour. Remember to replace both the drain plug and the fill plug gasket with new ones. Do not install these new gaskets until the final filling stage.
Rear Differential Fluid Capacity and Type
The rear differential typically takes 1.3 litres of fluid. The cheapest fluid you're likely to find will be around $70 per litre online. You will need approximately 7 litres in total for the transmission, as you cannot drain the entire 10 litres without removing the sump, which is a more involved process.
Transmission Fluid Change: A Detailed Procedure
The GTR's transmission fluid change is the most complex of the three, involving a specific multi-step procedure to ensure correct filling and operation. This process is critical for the longevity and performance of your vehicle's gearbox.
Step-by-Step Transmission Fluid Replacement
Step 1: Drain the Fluid. Remove the drain plug and the internal drain tube (using a 4mm hex) and allow all the old fluid to drain out. Step 2: Replace drain tube and drain plug. Reinstall the drain tube and drain plug, ensuring they are secure but not yet torqued to final specification. Step 3: Initial Fill. Fill the transmission with fluid until it begins to overflow from the fill hole. This will typically require around 6 litres. Step 4: Install Plugs (Temporarily). Install the drain plug and filler plug using their old gaskets. Step 5: Initial Gear Cycle. With the car on the ground, start the engine. With the gear lever in Park (P), wait for the transmission check to complete. Then, press the brake pedal and cycle through the gears: Automatic (A) for 5 seconds, Neutral (N) for 5 seconds, Reverse (R) for 5 seconds, and back to Park (P). Shut off the engine. Step 6: Second Fill. Remove the drain plug and filler plug again. Fill the transmission with more fluid until it overflows. This will likely require an additional litre. Step 7: Install Plugs (Temporarily). Install the drain plug and filler plug using their old gaskets once more. Step 8: Engine Warm-up and Gear Cycle. Start the engine again. With the gear lever in Park (P), let the engine idle until the transmission temperature reaches 122°F (50°C). Once at temperature, press the brake pedal and repeat the gear cycling procedure: A for 5 seconds, N for 5 seconds, R for 5 seconds, then back to P. Shut off the engine. Step 9: Final Drain and Fill. Wait for 5 minutes. Remove the drain plug. Allow the fluid to drain until it flows at a rate of approximately one drop per second. This step must be performed within 25 minutes of the transmission being warm. Step 10: Final Plug Installation. Install the drain plug with its new gasket and torque it to 15 lb-ft. Install the filler plug with its new gasket and torque it to 25 lb-ft. Finally, reinstall the heat shield and the front diffuser panel.
Fluid Specifications: GL4 vs. GL5
A common question regarding driveline fluids is the compatibility of GL-4 and GL-5 specifications. The GTR transmission specifically calls for GL-4 fluid. It is generally understood that GL-5 oil cannot be used as a direct replacement for GL-4 if there are brass components within the transmission. Brass is sensitive to the extreme pressure additives found in GL-5. While GL-4 can typically be used in place of GL-1, GL-2, and GL-3, the reverse is not always true. Always consult your owner's manual or a trusted GTR specialist to confirm the precise fluid requirements for your vehicle, especially when considering aftermarket fluid options. Using the incorrect fluid can lead to premature wear and costly damage to the transmission's synchronizers and other internal components.
Summary of Fluid Capacities and Torque Specs
To summarise, here are the key figures you'll need:
| Component | Fluid Capacity (approx.) | Fill Plug Torque | Drain Plug Torque | Drain Tube Hex Size |
|---|---|---|---|---|
| Front Differential | 0.7 litres | 25 lb-ft | 25 lb-ft | N/A |
| Rear Differential | 1.3 litres | 25 lb-ft | 25 lb-ft | N/A |
| Transmission | 7 litres (approx. drained) | 25 lb-ft | 15 lb-ft | 4mm |
Frequently Asked Questions
Q1: Can I use GL-5 oil in my GTR transmission if it calls for GL-4?
It is strongly advised against. GL-5 fluids contain higher levels of extreme pressure additives that can be corrosive to brass synchroniser rings, which may be present in your GTR's transmission. Stick to the manufacturer-specified GL-4 fluid.
Q2: How often should I change my GTR's differential and transmission fluids?
The FSM recommends every 36,000 miles for normal driving. For track use or aggressive driving in high temperatures (248-284F), reduce this interval to 3,000 miles. If temperatures exceed 284F, an immediate fluid change is mandatory.
Q3: What are the signs that my transmission fluid needs changing?
Look out for a change in fluid colour (it may become darker or murky), an unusual smell (burnt odour), or any new noises or rough shifting from the transmission. Regular fluid analysis can also help detect degradation.
Q4: Why is the transmission fluid procedure so complex?
The multi-step process ensures that the transmission is filled to the correct level and that the internal hydraulic circuits are properly primed. This is crucial for the proper functioning of the advanced dual-clutch transmission in the GTR.
Q5: Where can I find the correct fluids?
Always refer to your GTR owner's manual for the exact specifications. Reputable automotive parts suppliers and authorised Nissan dealerships are good sources. As noted, some fluids may be available at a lower cost through other manufacturers' dealerships if they meet the same specifications.
Performing these fluid changes yourself can be a rewarding experience, saving you money and giving you a deeper understanding of your GTR's mechanics. Always prioritise safety, use the correct tools and fluids, and follow the procedures meticulously for the best results.
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