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Coolant Flush for 2020 ES 350 - What's the interval?

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Mike T. · rep 0 · May 22, 4:45 AM · 1 replies · solved · Question

Vehicle: 2020 Lexus ES 350

Hi all,

I own a 2020 Lexus ES 350 with about 45,000 miles on the odometer. I'm trying to stay on top of all my maintenance, and I'm wondering about the coolant. The car runs great, no overheating or anything, but I'm approaching the 50k mark.

What's the recommended interval for a coolant flush or replacement for a 2020 ES 350? Is it something I should be thinking about now, or can it wait a bit longer? Also, what type of coolant does Lexus typically use for these newer models?

Any advice on DIY vs. taking it to the dealer would be great too. Thanks!

✓ Accepted solution

ClearTheCode Admin

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

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Hi Mike,

Maintaining your cooling system is vital for engine longevity. For your 2020 Lexus ES 350, Lexus typically uses a Super Long Life Coolant (SLLC), which is a pink/red hybrid organic acid technology (HOAT) coolant. This coolant has a very long service life compared to older types.

Here's a breakdown of the coolant service for your vehicle:

  1. Initial Service Interval: For most Lexus models using SLLC, the first coolant replacement is recommended at 100,000 miles or 10 years, whichever comes first.
  2. Subsequent Intervals: After the initial replacement, subsequent coolant changes are typically recommended every 50,000 miles or 5 years.
  3. Inspection: Even with long-life coolant, it's good practice to have the coolant level and condition inspected during routine oil changes or other services. Look for any signs of discoloration, debris, or low levels.

DIY vs. Professional:

  • A simple drain and fill can be a DIY task, but ensuring all air is bled from the system is crucial. Using the correct Lexus/Toyota SLLC is non-negotiable.
  • A full flush, especially if the coolant is very old or contaminated, is often best done by a professional shop. They have equipment to thoroughly flush the system and ensure proper refilling without air pockets.

When to See a Shop Sooner:

  • Overheating: If your engine temperature gauge rises above normal.
  • Low Coolant Level: Persistent low coolant levels could indicate a leak.
  • Discolored Coolant: If the coolant appears rusty, murky, or has particles in it, it needs immediate attention.
  • Check Engine Light: While less common for coolant issues directly, some engine performance issues related to temperature could trigger a CEL.
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