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Hesitation after 70k miles – Time for transmission fluid service on my RX?

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

Vehicle: 2018 Lexus RX 350 F Sport

My 2018 Lexus RX 350 F Sport just hit 70,000 miles, and lately, I've noticed some slight hesitation when accelerating, especially from a stop. It's not constant, but it's enough to make me wonder.

I've heard conflicting advice about transmission fluid changes on modern Lexus vehicles – some say it's "lifetime," others say it should be serviced. I'm trying to be proactive with maintenance.

Do you think this hesitation could be related to the transmission fluid? What's the recommended interval for a fluid change or flush for my model year? I want to avoid any major issues down the road.

✓ Accepted solution

ClearTheCode Admin

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

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  1. Check Fluid Level & Condition: Before anything else, check your transmission fluid level and condition. On many Lexus models, this requires a specific procedure, often involving checking at a certain temperature. If the fluid is dark, smells burnt, or is low, it's a strong indicator for service.
  2. Lexus Recommendations: While Lexus often states "lifetime" fluid, this generally means lifetime under ideal conditions. For vehicles driven in stop-and-go traffic, towing, or extreme temperatures, fluid degradation can occur faster. A general recommendation for proactive maintenance is every 60,000-100,000 miles, especially if you're experiencing symptoms.
  3. Causes of Hesitation:
    • Degraded Fluid: Old, oxidized transmission fluid loses its lubricating and cooling properties, leading to increased friction and potential slippage or hesitation.
    • Clogged Filter: A dirty transmission filter can restrict fluid flow, causing pressure issues within the transmission.
    • Solenoid Issues: Less common, but faulty solenoids can affect gear engagement.
    • Engine/Fuel System: Sometimes, hesitation can be engine-related (e.g., spark plugs, fuel injectors, air filter), so ensure other basic maintenance is up to date.
  4. When to See a Shop: If you're unsure about checking the fluid yourself, or if you decide a fluid service is needed, it's best to take it to a qualified Lexus technician. They have the specialized tools and knowledge for proper fluid type (WS ATF is common for Lexus) and the correct procedure, which often involves a drain and fill, not a full flush, for high-mileage transmissions to avoid dislodging debris. If you have any dashboard warning lights, definitely get it scanned.
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