Oil changes with testing (1 Viewer)

[Huntski]

IMHO, it's a waste of money. What are you going to do if you get bad results? I seriously doubt Lexus would acknowledge an oil test. The engine is warrantied. If there's an issue, it should be covered. Change intervals should always be based on the filter size. Since the GX has one the size of a tea cup, I don't know how they get away with 10k changes. My first was at 500 also. I go no more than 3k

Sometimes it’s not about the warranty. I’d like to put 200k or more on mine and am doing the same thing.

 

[JoeRob]

I just had my 6 month check, mileage about 2600, and I asked about the oil change. The Advisor said "What oil Change?" I asked if the oil was not going to be changed and he said no - That happens at 10k. I said - Ok, it is your warranty.
All the vehicles I have owned since late 1990s I have changed the oil at 10k with Mobil 1. I have never had any issues with oil, oil use or engine damage. I pulled a couple of samples and there were never any issues with engines/oil useage. I quit sampling.

 

[garmin935]

I did more research and I have been told that the high Moly levels in the initial UOA is from the assembly line they used when the engine was assembled. This explains why everyone’s initial UOA shows high moly and all subsequent samples never have moly levels as high as the baseline sample. Nothing to see here. Totally normal.

 

[damooji]

I did more research and I have been told that the high Moly levels in the initial UOA is from the assembly line they used when the engine was assembled. This explains why everyone’s initial UOA shows high moly and all subsequent samples never have moly levels as high as the baseline sample. Nothing to see here. Totally normal.

While can’t confirm for GX, I know this was a topic for the FL5. Everyone’s UOA was showing high moly for factory fill. Turns out being the oil, which isn’t sold in the US therefore not used at dealers. I ended up going with HPL which showed similar amounts of moly as ff.

 

[katsumoto]

The Youtube "Car Care Nut" mechanic suggested that oil changes be more frequent than regular aspirated engines. On his Tundra with the same engine he is changing it less than 5000 mile intervals. I am doing the same. Just did my 500 mile break in. Going to do 1000, 3000 and maybe 4000 intervals. As he said oil is cheaper than engines. Additionally I drive mostly City which is bad for the engine.

 

[RetiredSteelWorker]

I came back to reread this thread after finding the linked YT video. Warning, the video gets seriously geeky very quickly.



The video is from the guy behind SPEEDiagnostix. He starts out talking about the first oil change (500 miles) in his daughter’s new 2023 Toyota Corolla.

About 1/3 into the video he starts a deep dive talking about oil analysis numbers and PPM readings and differences in oil, oil additives, blah blah blah … the geekiness about tribology shoots up and remains off the charts for the remainder of the video.

Points I found interesting:

• He takes a sample of new clean oil to use as a baseline in the future. Same as @BostonNewbie does in his original post.
• After the oil is drained and the drain plug is still open, he sacrifices one bottle of new clean oil to flush out any remnants of new engine wear debris (mentioned at 6:08). The old filter is still on when he does this.
• He says Exxon Mobil makes Toyota’s motor oil.
• He says apply new, clean oil into the new filter, and (of course) on the gasket on the new filter.

He flashes up SPEEDiagnostix analysis reports a lot. And he owns the company so I wouldn’t ding him for some self promotion.

 

[Dv88]

Change mine at 5k miles after the first change.

 

[solluna]

changed mine at 1k, 4k, and 3-4k thereafter.

 

[roaniecowpony]

I just got my SpeeDiagnostix UOA back on my new 2025 GX550 after a 545 mile first oil change. I’m noticing the same thing in my analysis that I’m seeing elsewhere, including the sample above. The oils don’t look to be the same. What is the factory fill oil that Toyota is using? Because it’s not what they’re selling at the dealerships. Look at the moly levels in the factory fill and in the sample taken from new unused Toyota 0W-20 in the example, above.

Assembly lube?

 

[roaniecowpony]

I just changed the oil in my wife's at about 630 miles. No sample, no extra quart to flush. I saw a Youtube where the guy said there was a failure problem with these engines, due to contamination of the oil. I think I'll change it again in 1000 miles. Then probably do 5000 mile OCIs. Since I paid for full mechanical service, I'm sure they'll want to go the full distance of the recommended OCI. That means I'll likely do a change in the middle.

 

[jeffhardee]

My 2026 Tundra (same engine) has oil that looks like water. I'm not talking viscosity. I'm talking appearance. I've never seen oil that clear in my (long) life----except for mineral oil.

According to Lake Speed Jr., break-in continues for about 10k miles. I'll be doing the 1k, 5k oil changes. I'll change other fluids at 30-40,000.

 

[JoeRob]

I completed a 500 mile engine break-in oil change on my 2025 Overtrail. I completed the work with OEM oil and filter. I plan to use OEM for the foreseeable. I also had the oil tested (along with having the fresh Toyota 0W-20 oil tested as a baseline). See attached for the results that I just got. I plan to continue to have the oil tested for at least the first couple of years just to keep an eye on the break in period and stave off any issues if they happen to arise. I plan to do another change at 1,500 miles and then every 5k miles thereafter. If others think it would be helpful I can post the results of the oil tests for those future oil changes, just let me know if it's worth my time.

Tells me the oil sample is NORMAL for a new engine going through break in. If this is the first oil sample taken, there is NO PREVIOUS sample and the analysis indicates a new engine just starting into the break-in. Those particular numbers with red indication will trend up/stay high until the engine reaches a point which indicates the engine is "broken in" and should reduce in value to a steady state value.
That is my experience with oil sampling starting with a new engine. Just talk to Lexus and get their input.
Best....

 

[jeffhardee]

Tells me the oil sample is NORMAL for a new engine going through break in. If this is the first oil sample taken, there is NO PREVIOUS sample and the analysis indicates a new engine just starting into the break-in. Those particular numbers with red indication will trend up/stay high until the engine reaches a point which indicates the engine is "broken in" and should reduce in value to a steady state value.
That is my experience with oil sampling starting with a new engine. Just talk to Lexus and get their input.
Best....

My friend, Lexus/Toyota let the robots send out thousands of defective engines with NO quality control whatsoever. With that in mind, do you really think they give a shit about science and oil samples?

 

[bronco21]

I’ll do a 1000, 5000, 10,000, and then 7500/yearly for the life.
Will not test.