RECALL 25LA07 (25LB07 Interim Notice) - Engine Recall - UPDATED: DEC 18, 2025

[carrera mike]

Deleted

 

[Joe T]

I don't think this a machining debris issue. I really think the debris in engine is from bearing failure from low viscosity oil and or problems with oil circulation in the engine. What do I know? This is not good

Man I can’t scream it any louder. I even have text from the day of purchase about vibrations that felt hydraulic. Heck I may find them and screen shoot them. 16 miles on it.

Swap to 5w-30 at around 14k miles and it immediately smoothed out. Was a jittery pain in the ass before that.

Better yet on cold days when viscosity is higher it runs even smoother. Like so smooth I had people comment how smooth it runs at idle. (It just started cooling off in Houston)

 

[snowman69]

l

 

[Joe T]

Not to mention unavailable first gear when accelerating from a rolling stop. It relies all on motor and gets you into max boost immediately without rpm pushing oil.

Thats cool on a racetrack when you are running 5w-50 but not here.

Fuel economy, reduced particulate matter but increased NOx. I doubt that first gear strategy is anything besides that.

 

[OGBeno]

I posted this on the V35A-FTS breakdown thread, and it has detailed revision list.

I asked Chat GPT this, "Just on the LX600 V35A-FTS engine, what is causing the main bearing problems of that engine and what revisions the Toyota Lexus have done to mitigate those problems specially starting July 2024?"
Here's what Chat GPT says:

Below is a clear, LX600-specific explanation of the root cause of the V35A-FTS main-bearing issues and the exact revisions Toyota/Lexus implemented, with emphasis on the major July 2024 update—the point at which Lexus made the biggest internal durability upgrade to this engine.

The LX600 has the same core issues seen across the V35A family, but the heavy curb weight, tall gearing, and high sustained load make the problems more pronounced in this model.

Here are the four actual causes of the main-bearing wear issue:
1. High Oil Temperatures During Heavy Load (Most Critical Issue)

The LX600—due to its mass and boost-heavy tuning—generates high oil temperatures during:
long climbs
high-speed desert driving
towing
deep-sand/off-road use
Early V35A oil coolers struggle to shed heat → oil thins → the hydrodynamic film at the main bearings collapses, accelerating wear.

This is the number one root cause.

2. Center Oil Gallery Restriction (Design Weakness)

The No.2 and No.3 main bearings receive oil through a narrow vertical passage.
In the LX600, under high-temp + high-load conditions, this causes:
pressure drop at the center mains
reduced oil wedge formation
localized bearing fatigue

This flaw is specific to early blocks and is one of the major things Lexus fixed in July 2024.

3. High Low-RPM Torque Loads (Calibration Issue)
The earliest calibrations allowed full boost at very low RPM—especially in the LX600, which is tuned for strong low-end torque.

This causes:
high crankshaft bending loads
high bearing unit-pressure
repeated pounding of the main bearings when oil film is thinnest
Later calibrations reduce low-RPM torque to protect the engine.

4. Oil Aeration/Foaming (Under Rapid Load Changes)

The LX600’s variable-displacement oil pump sometimes overshoots flow at high RPM transitions.

This leads to:
micro-bubbles in oil
reduced load-carrying capacity
increased bearing wear under high load
Toyota addressed this in software, not hardware.

Major milestone: July 2024 production update

This is when oiling, bearings, cooling, and crankshaft changes were rolled into LX600 production.

Below are the exact revisions and how they address the root causes above.

Introduced: July 2024 production for LX600

The center oil gallery feeding the #2/#3 mains was enlarged and straightened, improving:
oil volume
pressure stability
flow uniformity to center mains
This is the single biggest engineering fix.

Block P/N superseded:
11400-38020 → 11400-38021
The LX600 received updated mains with:
stronger overlay
improved fatigue resistance
better heat stability
more consistent crush height

Bearing set supersession:
11701-38020 → 11701-38021
This solves heat-induced bearing wear.

New crankshaft machining spec:
smoother journal microfinish
improved fillet radius
reduced taper/ovality variation
Helps maintain oil wedge under high-load conditions specific to the LX600.

P/N: 13401-38010 → 13401-38011

The LX600 was among the first to receive the upgraded cooler:
larger plate stack
better low-speed heat rejection
improved stabilization during long climbs or sand driving

Oil cooler supersession:
15700-38010 → 15700-38011
This reduces the primary cause: high oil temps.

Deployed in waves, fully implemented by summer 2024.

Updates include:
● Oil Pump Logic
reduced high-RPM overshoot → reduced aeration
increased low-RPM pressure under load → better lubrication at mains
● Torque Management
reduced low-RPM torque spikes
smoother boost onset
better thermal/load prediction models
This directly lowers crankshaft bending loads.


Improved crankcase ventilation reduces:
oil dilution
oil foaming
vapor ingestion
P/N: 12204-38010 → 12204-38011

Cleaner oil = healthier main bearings.

Here are the July 2024 LX600-specific upgrades summarized clearly:


✔ Revised block casting with widened oil gallery
✔ Revised crankshaft (improved journal microfinish)
✔ New main-bearing set standardized across LX600
✔ Improved oil cooler fully implemented
✔ Updated oil pump targets in ECU firmware
✔ Updated torque management (low-RPM load reduction)
✔ Updated PCV valve for cleaner oil and lower aeration

These changes brought the LX600 to the most reliable form of the V35A-FTS produced to date.

Root Causes of Main Bearing Wear (LX600)
High oil temps → thinned oil film
Restricted center mains oil gallery
High torque at low RPM (early calibration)
Oil aeration under fast load changes

Fixes Toyota/Lexus Implemented

stronger bearing materials
redesigned oil passages (July 2024)
crankshaft microfinish update
larger oil cooler
revised PCV system
pump logic + torque management ECU updates

July 2024 is when the LX600 received the full suite of durability upgrades.

None of those part numbers are correct or even real supersessions or even applicable to the V35A engine family.

-38XXX part numbers belong to the UR family of engines.

Please stop even considering that ChatGPT has any real semblance of technical knowledge when it comes to things like part numbers or even part number supersessions.

It’s a bunch of gobbledygook bullshït.

 

[Joe T]

Yeah Chatgpt has some logic, what its saying is probably a semblance of what the “buzz” is on the internet.

What I found with the oil spec spreadsheets I did is it really has a hard time pulling specs and formatting them. I have noticed that specifically with part numbers too.

You have to cross check them, then have it redo it until it gets into a format it likes. Then you need to cross check them. Then it throws an attitude when you are taking up too much bandwidth so you have to manually search google or ask very nicely.

 

[OGBeno]

Yeah Chatgpt has some logic, what its saying is probably a semblance of what the “buzz” is on the internet.

What I found with the oil spec spreadsheets I did is it really has a hard time pulling specs and formatting them. I have noticed that specifically with part numbers too.

You have to cross check them, then have it redo it until it gets into a format it likes. Then you need to cross check them. Then it throws an attitude when you are taking up too much bandwidth so you have to manually search google or ask very nicely.

I don’t care what it does. Its information is patently wrong/incorrect/constructed from no knowledge at all.

It’s bullshït.

 

[Oakleyguy]

I don’t care what it does. Its information is patently wrong/incorrect/constructed from no knowledge at all.

It’s bullshït.

THIS^^^^^

 

[carrera mike]

None of those part numbers are correct or even real supersessions or even applicable to the V35A engine family.

-38XXX part numbers belong to the GR family of engines.

Please stop even considering that ChatGPT has any real semblance of technical knowledge when it comes to things like part numbers or even part number supersessions.

It’s a bunch of gobbledygook bullshït.

Lets remove the part numbers

 

[OGBeno]

Lets remove the part numbers

Let’s remove all of it. Part numbers are the language of the entire Toyota system.

Unless one is a materials scientist, a fluid dynamics engineer, or an engineer within the Toyota engine program ecosystem, everything publicly presented by any bullshǐt con artist YouTuber/ChatGpt expert is dubious at best, fugazi at worst.

 

[billjamin]

Man I can’t scream it any louder. I even have text from the day of purchase about vibrations that felt hydraulic. Heck I may find them and screen shoot them. 16 miles on it.

Swap to 5w-30 at around 14k miles and it immediately smoothed out. Was a jittery pain in the ass before that.

Better yet on cold days when viscosity is higher it runs even smoother. Like so smooth I had people comment how smooth it runs at idle. (It just started cooling off in Houston)

Did you have the dealer do the 5w or did you do it yourself. I'm approaching 10k and might ask them to go to the 5w but it sounds like dealers are getting weird about it.

 

[MRego]

Did you have the dealer do the 5w or did you do it yourself. I'm approaching 10k and might ask them to go to the 5w but it sounds like dealers are getting weird about it.

The "all hail to his name" Car nut says no need to change oils. Just change more frequently. See towards the very end. Thoughts?

 

[rexington14]

Did you have the dealer do the 5w or did you do it yourself. I'm approaching 10k and might ask them to go to the 5w but it sounds like dealers are getting weird about it.

I don't own this motor, but if I did own one still under warranty and not covered under the recall I would not change the viscosity or otherwise do anything that could possibly give cause for Toyota/Lexus to void a warranty claim.

 

[ikarus]

Yup unfortunately no one actually knows anything. The only concrete data comes from whatever Toyota has decided to tell the NHTSA.

From there you just have to decide if you fall into one of two camps:
1. "I'm a true corporate believer and Toyota has never lied in the past and would have nothing to gain from lying to me now so I believe in The Debris"
2. "This engine has a design flaw"

And as far as AI, if you understand how LLMs work you wouldn't trust it completely. It's just scraping data from around the internet from sites like Autoblog or The Drive which lately have been scraping stories and anecdotes from forums and social media, and those people are just making things up or interpreting the NHTSA docs themselves, which we don't even know if those are completely truthful.

Just look at how accurate it is with something as simple as lug nut torque:

"For a 1997 Toyota Land Cruiser (100 Series)" ??

 

[Canyonero]

Yup unfortunately no one actually knows anything. The only concrete data comes from whatever Toyota has decided to tell the NHTSA.

From there you just have to decide if you fall into one of two camps:
1. "I'm a true corporate believer and Toyota has never lied in the past and would have nothing to gain from lying to me now so I believe in The Debris"
2. "This engine has a design flaw"

It's funny because LLMs are also likely pulling and packaging posts from this site to tell us what's going on.

Spaceballs: "You're looking at now now. Everything that's happening now, is happening now."

But yes, clearly there is an engine design flaw. Debris Shebris. I don't buy it. It's what every OEM says when their engines blow up. We have a Wrangler Rubicon 4xE and those 2.0 turbos are also failing because of, wait for it... debris from the production process.

Hot Take: This is all a deep state conspiracy to get people to buy EVs. None of these ICE issues are present with EVs. (I don't really think it's a conspiracy, but it's interesting how many OEMs are dealing with grenading engines and transmissions right now..)

 

[LX Cruiser]

Lets remove the part numbers

Removing only bits of data that are immediately verifiably wrong means we’re still assuming it’s correct until proven wrong, and that is absolutely the wrong way to approach what an LLM spits out, especially regarding a topic where 99% of the data that exists on the internet is pure (and often confidently wrong) speculation, not to mention other misleadingly suggestive AI drivel meant to drive clicks with zero substance.

It is merely aggregating all of the info on the internet, from great to speculative to total dog**** and making a word milkshake out of it.

 

[Oakleyguy]

Removing only bits of data that are immediately verifiably wrong means we’re still assuming it’s correct until proven wrong, and that is absolutely the wrong way to approach what an LLM spits out, especially regarding a topic where 99% of the data that exists on the internet is pure (and often confidently wrong) speculation, not to mention other misleadingly suggestive AI drivel meant to drive clicks with zero substance.

It is merely aggregating all of the info on the internet, from great to speculative to total dog**** and making a word milkshake out of it.

Which also means it's scraping itself .

1. Ask GPT, post on Mud.
2. GPT scans mud and incorporates its own answers into future answers.
3. Rinse and repeat.

Household vegetable oil is a suitable substitute for motor oil in the 2025 LX700. In fact you can also fill your fuel tank with it!

 

[eNx]

Which also means it's scraping itself .

1. Ask GPT, post on Mud.
2. GPT scans mud and incorporates its own answers into future answers.
3. Rinse and repeat.

Household vegetable oil is a suitable substitute for motor oil in the 2025 LX700. In fact you can also fill your fuel tank with it!

If we keep saying it over and over, it'll become an AI truth.

 

[Joe T]

Did you have the dealer do the 5w or did you do it yourself. I'm approaching 10k and might ask them to go to the 5w but it sounds like dealers are getting weird about it.

I did it myself.

 

[Hundy]

I did it myself.

Would asking the dealer to use 5w-30 void the warranty?