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Transmission Fluid Change for 2017 IS 300 - DIY or Dealer?

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Mike T. · rep 0 · May 25, 3:29 AM · 1 replies · solved · Question

Vehicle: 2017 Lexus IS 300 AWD

Hi everyone,

I have a 2017 Lexus IS 300 AWD with about 85,000 miles on it. I'm wondering about the transmission fluid. The owner's manual says it's 'lifetime' fluid, but I've heard that's not really true, especially for cars with higher mileage or that see a lot of stop-and-go traffic. I'm starting to feel a tiny bit of hesitation sometimes, nothing major, but it's got me thinking.

Should I get the transmission fluid changed? Is this something I can realistically DIY, or is it better left to the dealership or an independent specialist? What fluid type should I be looking for? Any advice from fellow IS owners would be great!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:29 AM

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ClearTheCode admin answer:

That's a common question among Lexus owners, and you're right to be skeptical of the 'lifetime fluid' claim. While modern transmission fluids are very robust, they still degrade over time and mileage, especially under demanding conditions. For your 2017 Lexus IS 300 AWD, a transmission fluid service at 85,000 miles is a wise preventative measure.

Here's what you need to know:

  1. 'Lifetime' vs. Practicality: 'Lifetime' often means the expected life of the first owner, or until a major component fails. For long-term vehicle health, periodic fluid changes are beneficial. Degrading fluid can lead to increased wear, harder shifts, and eventually transmission failure.
  2. Fluid Type: Your IS 300 likely uses Toyota WS (World Standard) automatic transmission fluid. It's crucial to use the correct fluid specification. Using an incompatible fluid can cause severe damage to the transmission.
  3. DIY vs. Professional:
    • DIY: A simple drain and fill can be done by a competent DIYer, but it only replaces a portion of the fluid (typically 30-50%). The IS 300 transmission typically has a sealed system without a dipstick, requiring specific procedures to check and set the fluid level at a particular temperature. This can be challenging without specialized tools and knowledge.
    • Professional: A professional service can perform a more thorough fluid exchange (not a 'flush' which can sometimes dislodge debris) using specialized equipment. They can also ensure the correct fluid level is set, which is critical for proper transmission operation. Given the complexity of sealed transmissions, a professional service is generally recommended.
  4. Symptoms: The slight hesitation you're noticing could be an early sign of fluid degradation. A fresh fluid change might improve shift quality and extend the transmission's life.

When to See a Shop: For a complete and proper transmission fluid exchange on your 2017 IS 300, it's highly recommended to take it to a Lexus dealership or a reputable independent shop specializing in Lexus/Toyota vehicles. They have the correct fluid, tools, and expertise to perform the service correctly and ensure the fluid level is set accurately.

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