Notices
RX - 4th Gen (2016-2022) Discussion topics related to the 2016 and up RX350 and RX450h models

Carbon Deposits

Thread Tools
 
Search this Thread
 
Old Oct 6, 2024 | 04:00 AM
  #1  
Hsultan's Avatar
Hsultan
Thread Starter
Rookie
5 Year Member
 
Joined: Jan 2021
Posts: 28
Likes: 0
From: NY
Default Carbon Deposits

Hi - i took my 2017 Rx 350 w/45k miles into the dealer for service. They’re saying the engine has carbon deposits and want $300 to clean the system. I’ve always used premium fuel.

Any idea on whether this is legit or not? Is it safe to take it elsewhere for less?

Thanks
Reply
Old Oct 6, 2024 | 06:13 AM
  #2  
sderman's Avatar
sderman
Advanced
 
Joined: Aug 2006
Posts: 647
Likes: 136
From: NJ
Default

Originally Posted by Hsultan
Hi - i took my 2017 Rx 350 w/45k miles into the dealer for service. They’re saying the engine has carbon deposits and want $300 to clean the system. I’ve always used premium fuel.

Any idea on whether this is legit or not? Is it safe to take it elsewhere for less?

Thanks
I'd pour in a bottle of Techron into a full tank of gas. I use it every 5,000 miles or so. And if you haven't been using a Top Tier gas brand, I would switch to it immediately.
Reply
Old Oct 6, 2024 | 07:02 AM
  #3  
jcg0324's Avatar
jcg0324
Instructor
Liked
Loved
Community Favorite
 
Joined: Feb 2021
Posts: 835
Likes: 408
From: PA
Default

Originally Posted by Hsultan
Hi - i took my 2017 Rx 350 w/45k miles into the dealer for service. They’re saying the engine has carbon deposits and want $300 to clean the system. I’ve always used premium fuel.

Any idea on whether this is legit or not? Is it safe to take it elsewhere for less?

Thanks
I don't believe premium or regular fuel will make a difference. It's the type of additives that help keep the engine clean. This dealer is looking to make some easy money. How is he going to clean off the top of the pistons without tearing the engine apart? Get a second opinion or better yet just forget it.

Reply
Old Oct 6, 2024 | 07:33 AM
  #4  
Oro's Avatar
Oro
Pole Position
10 Year Member
Community Builder
Loved
Community Favorite
 
Joined: Dec 2013
Posts: 3,466
Likes: 920
From: wa
Default

Cleaning for valve deposits is necessary on some engines; it should not be on yours.

Your engine has dual port and direct injection; this should not be necessary like on direct-injection only engines. A bottle of Gumout Regane HM or Techron every 3 to 4k miles should be all you really ever need. Premium vs. regular does not matter on this issue. PEA as an additive is highly effective (Gumout Regane, Techron, Redline FI), most additive detergents are not very effective.



Last edited by Oro; Oct 6, 2024 at 07:36 AM.
Reply
Old Oct 6, 2024 | 08:43 AM
  #5  
jrobe's Avatar
jrobe
Intermediate
 
Joined: Nov 2007
Posts: 250
Likes: 160
From: WI
Default

That is a $300 scam. That would be the last time I would go to that dealership. I would go to the nearest Toyota dealer from now on which is what I do anyway.
Reply
Old Oct 6, 2024 | 12:12 PM
  #6  
RGSW's Avatar
RGSW
Intermediate
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2009
Posts: 441
Likes: 113
From: NM
Default

Always use "Top Tier" Gas that has additives. Costco is Top Tier, Sam's Club is not.
https://www.toptiergas.com/gasoline-brands/
Reply
Old Oct 7, 2024 | 04:54 AM
  #7  
JimInTN's Avatar
JimInTN
Pit Crew
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Nov 2018
Posts: 222
Likes: 63
From: Tennessee
Default

Have you noticed a significant drop in MPG's or rough idle/running, etc?? It's probably just the dealer trying to get easy $$ by pouring the same stuff you can into the gas tank. I would get some of the recommended gas treatments, and pour the whole bottle into a half tank of gas, for a more concentrated dose, and go from there.
Reply
Old Oct 7, 2024 | 03:36 PM
  #8  
toyotaman7's Avatar
toyotaman7
Pole Position
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2016
Posts: 2,228
Likes: 904
From: Ontario
Default

Sounds like your dealer has detected a $300 bill in there that needs to be recovered for them. 😄
Reply
ClubLexus Stories

Celebrating Lexus & Toyota from Around the Globe

story-0

Toyota and Lexus Join Mille Miglia For The First Time

 Verdad Gallardo
story-1

Lexus NX 350h: A Fuel-Sipping Secret Hot Hatch???

 Michael S. Palmer
story-2

5 Best & 5 Worst Lexus Daily Drivers

 Joe Kucinski
story-3

Top 5 Hottest Lexus & Toyotas in 2026 (Hardest To Buy)

 Brett Foote
story-4

2026 Lexus IS 350 F Sport Review: The Last of Its Kind Still Rocks

 Michael S. Palmer
story-5

Top 10 Most Confusing Things Lexus Has Ever Done!

 Joe Kucinski
story-6

2026 Lexus ES Review: Lexus Re-Embraces Founding Principles

 Michael S. Palmer
story-7

10 Lexus Bargains That are Cheaper Than a New Toyota RAV4

 Joe Kucinski
story-8

8 Weirdest Things Lexus Has Ever Built

 Verdad Gallardo
story-9

10 Lexus Designs That Have Aged Like Fine Wine

 Verdad Gallardo
Old Oct 8, 2024 | 07:59 PM
  #9  
GS4_Fiend's Avatar
GS4_Fiend
Lexus Test Driver
15 Year Member
Liked
Loved
Community Favorite
iTrader: (22)
 
Joined: Aug 2008
Posts: 7,416
Likes: 237
Default

Originally Posted by Hsultan;[url=tel:11799368
11799368[/url]]Hi - i took my 2017 Rx 350 w/45k miles into the dealer for service. They’re saying the engine has carbon deposits and want $300 to clean the system. I’ve always used premium fuel.

Any idea on whether this is legit or not? Is it safe to take it elsewhere for less?

Thanks
If I were you, I would ask to show me the carbon buildup and where.
Reply
Old Oct 10, 2024 | 08:27 AM
  #10  
BR549's Avatar
BR549
10th Gear
 
Joined: Sep 2023
Posts: 12
Likes: 4
From: NC
Default

I would ask how they know my car with 45K miles has carbon deposits?
Reply
Old Oct 10, 2024 | 08:43 AM
  #11  
ravenuer's Avatar
ravenuer
Racer
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Nov 2017
Posts: 1,942
Likes: 581
From: New York
Default

Originally Posted by BR549
I would ask how they know my car with 45K miles has carbon deposits?
Because they need 300 bucks for their Christmas party.
Reply
Old Oct 18, 2024 | 04:31 AM
  #12  
Lexicon1's Avatar
Lexicon1
Advanced
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 2004
Posts: 730
Likes: 179
From: West Coast
Default

Originally Posted by BR549
I would ask how they know my car with 45K miles has carbon deposits?
Agree wholeheartedly, what is the proof ? Do they have a boroscope picture of the inside of the combustion chamber? If so, ask to see it and compare it to a similar mlileage model without deposits....
Reply
Old Oct 18, 2024 | 05:02 AM
  #13  
Lex2000TL's Avatar
Lex2000TL
Advanced
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 568
Likes: 162
From: Mid-West
Default

It is even more complicated, as carbon deposits are mostly formed on the back of exhaust vales. You cannot see them even with borescope.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
unebonnevi
RX - 3rd Gen (2010-2015)
8
Feb 10, 2024 09:55 PM
bmwlexus09
IS - 3rd Gen (2014-present)
9
Jan 22, 2019 09:57 AM
alien1974
LS - 1st and 2nd Gen (1990-2000)
2
Apr 23, 2016 03:25 PM
Pheonix
ES - 1st to 6th Gen (1990-2018)
79
Jul 9, 2014 09:18 AM
808-lexus
LS - 1st and 2nd Gen (1990-2000)
3
Jun 29, 2007 07:47 PM




All times are GMT -7. The time now is 04:02 PM.

story-0
Toyota and Lexus Join Mille Miglia For The First Time

Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.

By Verdad Gallardo | 2026-06-15 16:53:16


VIEW MORE
story-1
Lexus NX 350h: A Fuel-Sipping Secret Hot Hatch???

Slideshow: a quick review of the 2026 Lexus NX 350h F Sport Handling

By Michael S. Palmer | 2026-06-15 15:25:34


VIEW MORE
story-2
5 Best & 5 Worst Lexus Daily Drivers

Slideshow: The 5 best and 5 worst Lexus daily drivers

By Joe Kucinski | 2026-06-15 11:14:58


VIEW MORE
story-3
Top 5 Hottest Lexus & Toyotas in 2026 (Hardest To Buy)

These five Lexus and Toyota models are the most sought-after on the market right now.

By Brett Foote | 2026-06-15 10:47:52


VIEW MORE
story-4
2026 Lexus IS 350 F Sport Review: The Last of Its Kind Still Rocks

Slideshow: the 2026 IS 350 isn't all that new, and that's why we love it!

By Michael S. Palmer | 2026-06-04 14:35:23


VIEW MORE
story-5
Top 10 Most Confusing Things Lexus Has Ever Done!

Slideshow: 10 most confusing things Lexus has ever done.

By Joe Kucinski | 2026-06-04 09:40:55


VIEW MORE
story-6
2026 Lexus ES Review: Lexus Re-Embraces Founding Principles

Slideshow: Our First-Drive Review of the 2026 Lexus ES!

By Michael S. Palmer | 2026-05-29 20:30:16


VIEW MORE
story-7
10 Lexus Bargains That are Cheaper Than a New Toyota RAV4

Slideshow: 10 Lexus bargain that are cheaper than a new Toyota.

By Joe Kucinski | 2026-05-20 10:28:20


VIEW MORE
story-8
8 Weirdest Things Lexus Has Ever Built

Slideshow: From hoverboards to luxury yachts, these are the strangest projects Lexus has ever attached its badge to.

By Verdad Gallardo | 2026-05-16 11:34:36


VIEW MORE
story-9
10 Lexus Designs That Have Aged Like Fine Wine

Slideshow: Some luxury cars chase trends, but these Lexus models look better now than they did when they first rolled into showrooms.

By Verdad Gallardo | 2026-05-06 17:58:29


VIEW MORE