Spark Plug Replacement
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Joined: Aug 2021
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From: MI
Spark Plug Replacement
Took my 2018 GS 350 F Sport AWD to dealer for 100K scheduled maintenance on 12 9 25. Service adviser said I need to replace spark plugs. Car has 99,600k on clock. Runs fine, starts right up, acceleration and gas mileage are same as when I bought car in September 2024. Car had 74k when I bought it. Lexus.com recommends changing at 120k. Looking for feedback. Thanks in advance.
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Joined: Nov 2014
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From: Texas
Took my 2018 GS 350 F Sport AWD to dealer for 100K scheduled maintenance on 12 9 25. Service adviser said I need to replace spark plugs. Car has 99,600k on clock. Runs fine, starts right up, acceleration and gas mileage are same as when I bought car in September 2024. Car had 74k when I bought it. Lexus.com recommends changing at 120k. Looking for feedback. Thanks in advance.
Last edited by bclexus; Dec 13, 2025 at 07:00 PM.
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Joined: Dec 2013
Posts: 3,466
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From: wa
Took my 2018 GS 350 F Sport AWD to dealer for 100K scheduled maintenance on 12 9 25. Service adviser said I need to replace spark plugs. Car has 99,600k on clock. Runs fine, starts right up, acceleration and gas mileage are same as when I bought car in September 2024. Car had 74k when I bought it. Lexus.com recommends changing at 120k. Looking for feedback. Thanks in advance.
Important to change the PCV valve on these engines, though. Did they, or has it been done at some point? Easy DIY if not; $10 or less part.
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It's true b*tch to get back there to where the valve is but I am an idiot because I completely forgot about this when I changed my plugs to maintain my emissions warranty..... the last plug on that side is literally right there and it's the exact same effort repeated to get to the PCV piece....annoying
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Joined: Dec 2013
Posts: 3,466
Likes: 920
From: wa
It's true b*tch to get back there to where the valve is but I am an idiot because I completely forgot about this when I changed my plugs to maintain my emissions warranty..... the last plug on that side is literally right there and it's the exact same effort repeated to get to the PCV piece....annoying
https://www.harborfreight.com/38-in-...EaAr4KEALw_wcB
When you DIY this job, a 19mm crow’s foot wrench can make all the difference. Here’s a whole set of metric ones at HF for $15, for reference. IIRC, the pcv valve takes a 19mm.
https://www.harborfreight.com/38-in-...EaAr4KEALw_wcB
https://www.harborfreight.com/38-in-...EaAr4KEALw_wcB
Appreciate you champ! Thank you. I am going to knock this out soon as I pick this part up.
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