Oil analysis report - 2026 iForce Max Hybrid engine (~800 miles on oil, total miles ~1500)

[Dario]

Below is my report from oil analyzers. I expected the gas in the oil to be high due to direct injection, but most of the last 300 miles before testing were freeway miles. The aluminum is not too high, but the Silicon is quite high. Not sure why the silicon is high - maybe gasket sealant? Unfortunately I did not get analysis done on the oil from the first 700 miles.

In the notes they tell me to let them know that it's direct injection. I assume this so they won't call the amount of gas high. I see now way to do this on their equipment list.

Couple of complaints:
- I didn't get any email update about my sample getting received or tested by them
- Their online tools to set up equipment and submit samples is terrible. I do software for a living. This is right out of the early 2000s from a UI perspective

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[rosnaby]

Below is my report from oil analyzers. I expected the gas in the oil to be high due to direct injection, but most of the last 300 miles before testing were freeway miles. The aluminum is not too high, but the Silicon is quite high. Not sure why the silicon is high - maybe gasket sealant? Unfortunately I did not get analysis done on the oil from the first 700 miles.

In the notes they tell me to let them know that it's direct injection. I assume this so they won't call the amount of gas high. I see now way to do this on their equipment list.

Couple of complaints:
- I didn't get any email update about my sample getting received or tested by them
- Their online tools to set up equipment and submit samples is terrible. I do software for a living. This is right out of the early 2000s from a UI perspective

How often is your plan to change oil? Are you going to start lengthening your oil change intervals more towards the 5k mark? does this data change any of that?

 

[Dario]

I plan to change it again at 5K and then probably every 4K. I'll get more analysis done and will change at 3K if it continues to have high gasoline percentage, but I'm hoping 4K works.

I forgot to mention that my oil was surprisingly dark, especially with only 800 miles on it.

 

[ls3673]

Does anyone know if the car both direct injection and Port Injection? If so, does that eliminate the carbon buildup issues on the intake manifold?

 

[Crewser]

Does anyone know if the car both direct injection and Port Injection?

Both The Car Care Nut and Sarah N Tuned mentioned that it is both port- and direct-injected.

 

[CMill4Runner]

Are you doing another analysis at those oil change intervals, if so should tell a better story?

 

[Nodak]

Does anyone know if the car both direct injection and Port Injection? If so, does that eliminate the carbon buildup issues on the intake manifold?

toyota hasnt done DI only since the 1990s and 2000s with the old D-4 engines. they moved to D-4S afterwards (DI and Port)

 

[Nodak]

these are the codes after the engine

Key 4Runner Engine Codes by Generation:

• 6th Geb (2025+): T24A-FTS (2.4L I4)
• 5th Gen (2010+): 1GR-FE (4.0L V6)
• 4th Gen (2003–2009): 1GR-FE (4.0L V6), 2UZ-FE (4.7L V8)
• 3rd Gen (1996–2002): 5VZ-FE (3.4L V6), 3RZ-FE (2.7L I4)
• 2nd Gen (1990–1995): 3VZ-E (3.0L V6), 22R-E (2.4L I4)
• 1st Gen (1984–1989): 22R/22R-E (2.4L I4), 3VZ-E (3.0L V6)

the codes after the "-"

• A - Valvematic variable lift intake head
• B - Twin SU-style side-draft carburetors (After 2000, 'B' indicates capability for E85 Ethanol)
• C - Carburated / California Emissions Controlled
• D - Twin Downdraft carburetors
• E - Electronic Fuel injection
• F - Economy narrow-angle valve DOHC
• G - Performance wide-angle valve DOHC
• H - High compression, High-pressure charged
• I - Single-point fuel injection
• J - Autochoke in early models, unknown pollution control later
• L - Transverse
• M - Philippines' market
• N - CNG fuel
• P - LPG fuel
• R - Low Compression (uses 87 and below octane fuel)
• S - Swirl intake
• SE - D-4 Gasoline Direct Injection
• T - Turbocharged
• U - Japan-spec emissions w/ catalytic converter
• V - Common Rail Diesel Injection (D-4D)
• X - Atkinson cycle (most-used on hybrids)
• Z - Supercharged

 

[ls3673]

these are the codes after the engine

Key 4Runner Engine Codes by Generation:

• 6th Geb (2025+): T24A-FTS (2.4L I4)
• 5th Gen (2010+): 1GR-FE (4.0L V6)
• 4th Gen (2003–2009): 1GR-FE (4.0L V6), 2UZ-FE (4.7L V8)
• 3rd Gen (1996–2002): 5VZ-FE (3.4L V6), 3RZ-FE (2.7L I4)
• 2nd Gen (1990–1995): 3VZ-E (3.0L V6), 22R-E (2.4L I4)
• 1st Gen (1984–1989): 22R/22R-E (2.4L I4), 3VZ-E (3.0L V6)

the codes after the "-"

• A - Valvematic variable lift intake head
• B - Twin SU-style side-draft carburetors (After 2000, 'B' indicates capability for E85 Ethanol)
• C - Carburated / California Emissions Controlled
• D - Twin Downdraft carburetors
• E - Electronic Fuel injection
• F - Economy narrow-angle valve DOHC
• G - Performance wide-angle valve DOHC
• H - High compression, High-pressure charged
• I - Single-point fuel injection
• J - Autochoke in early models, unknown pollution control later
• L - Transverse
• M - Philippines' market
• N - CNG fuel
• P - LPG fuel
• R - Low Compression (uses 87 and below octane fuel)
• S - Swirl intake
• SE - D-4 Gasoline Direct Injection
• T - Turbocharged
• U - Japan-spec emissions w/ catalytic converter
• V - Common Rail Diesel Injection (D-4D)
• X - Atkinson cycle (most-used on hybrids)
• Z - Supercharged

Thus is good info. Thanks for sharing.

 

[Nodak]

the codes after the dash is universal, not to just the 4R

 

[Nodak]

in case anyone doesnt compute, "S" is swirl aka port injection

so D-4S = "D-4" is direct injection + "S" for swirl or port injection


but technically the fuel delivery system is coded out as ... (which doesnt show in the overall engine code of "T24A-FTS")

D-4ST direct/port injection

The T24A engine is a straight-four engine series that was first introduced in 2021 for the AZ20 series Lexus NX.

 

[Dario]

Are you doing another analysis at those oil change intervals, if so should tell a better story?

That is the plan. I'd also like to do one after a long drive (100+ miles) and pull some oil to see if most of the gasoline gets evaporated out. With the direct injection and constant re-starting of the hybrid engine, constant gas contamination is a concern.

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