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2016 RX 350 Transmission Fluid Change - DIY or Dealer?

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Mark S. · rep 0 · May 22, 4:45 AM · 1 replies · solved · Question

Vehicle: 2016 Lexus RX 350 Base

My 2016 Lexus RX 350, with about 85,000 miles, has never had its transmission fluid changed. I've heard conflicting advice – some say it's "lifetime" fluid, others say it absolutely needs changing. I'm starting to feel a slight hesitation when shifting, especially from 2nd to 3rd.

Is this something I can tackle myself, or should I take it to a professional? What type of fluid does it even take? I'm pretty handy but haven't done a transmission service before. Any advice on the process or recommended fluid would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:45 AM

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ClearTheCode admin answer:

Lexus, like many manufacturers, often refers to transmission fluid as 'lifetime' fluid. However, this typically means it's designed to last the expected service life of the vehicle under ideal conditions, which doesn't always align with long-term ownership or severe driving conditions. Given your 85,000 miles and the slight hesitation, a fluid change is a wise preventative measure.

Here's what you should consider:

  1. Fluid Type: Your 2016 Lexus RX 350 requires Toyota/Lexus WS (World Standard) automatic transmission fluid. Using any other type can cause significant damage.
  2. DIY Feasibility: A simple drain and fill can be a DIY job for someone with moderate mechanical skills. It involves draining the fluid from the pan and refilling it. This replaces only a portion of the total fluid. A full 'flush' or fluid exchange, which replaces nearly all the fluid, is more complex and often requires specialized equipment.
  3. Process:
    • Locate the drain plug on the transmission pan.
    • Drain the old fluid into a suitable container.
    • Replace the drain plug with a new washer.
    • Refill with the correct amount of new WS fluid through the fill port (often accessed from the top or side of the transmission).
    • Check the fluid level accurately according to the service manual (often involves specific temperature ranges).
  4. When to See a Shop:
    • If you're uncomfortable with the process or ensuring the correct fluid level and temperature.
    • If you want a full fluid exchange, as this typically requires a professional machine.
    • If the hesitation worsens or you notice any other unusual transmission behavior after a fluid change, as it could indicate a deeper mechanical issue. A shop can also perform a diagnostic scan for any hidden codes.
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