🔴💊 Engine Oil Red Pill Thread: Only Post If You Have UOA - Official Honda Civic Type R K20C1 Engine Oil Analysis

[johnloov]

Official UOA (Used Oil Analysis) Thread – Data-Only Civic Type R Engine Oil Results (FL5 & FK8)

READ FIRST – This is a Scientific Thread, Not a Speculation Thread
This thread is strictly dedicated to Civic Type R owners (FL5 and FK8) who are contributing Used Oil Analysis (UOA)data, to build a collective understanding of how various engine oils actually perform under real-world and track conditions.

Post Requirements:
Please ONLY post if you have UOA results from a lab like Blackstone, Speediagnostix, or similar. Each post should include:

1. Oil Brand and Viscosity (e.g. Honda Ultimate 0W-20, Redline 5W-30, Motul 300V 0W-30)
2. Miles on Oil
3. Track Use or Street Use (or mix)
4. Engine Temp Ranges Observed
5. Modifications (Stock or not; e.g. downpipe, tune, etc.)
6. UOA Report Screenshot or Attachment
7. Optional: Oil change interval history or patterns (e.g. every 2K mi / every 3 track days)

Let’s use this thread as a repository of real data, so we can finally move past speculation, internet myths, and unsubstantiated claims about oil viscosity, wear, or performance.

DO NOT POST IF:

• You’re sharing an opinion without UOA data.
• You’re debating viscosity theory without evidence.
• You’re here to argue about brand loyalty or marketing claims.

There are many other threads to explore those discussions. This thread is for data only.

The Goal:
To create a clean, ongoing repository of scientific oil testing data from the Civic Type R community to inform decisions on:

• Which oils protect best under hard use
• How track sessions impact oil condition and wear
• What change intervals make the most sense based on engine wear metals
• What trends emerge over multiple oil changes using the same oil

Let’s keep it respectful, tight, and focused. Please do not comment unless you're sharing UOA results or asking a clarifying question directly about someone’s posted data.

Ideally, run the same oil, at least 3 oil changes in a row to start to get decent data.

If you'd like to give feedback or discuss theories, there are existing separate threads - Let's maintain the integrity of this one.

ONLY THOSE THAT HAVE DATA - PLEASE Contribute

Start Posting Below — Post Your Oil Samples Here!

Let’s build the most useful, data-driven oil performance thread on the internet for the Civic Type R.



============================================================================

Here is my baseline results with Honda Factory Fill and Honda Ultimate 0W-20.

My car was 80-90% used at Laguna Seca, 10-20% on street - mostly to and back from Laguna Seca. The car was run as hard as you can fully OEM Spec.
1.44.87 min Laguna Seca

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[Tougefl5]

🥱

 

[johnloov]

Official UOA (Used Oil Analysis) Thread – Data-Only Civic Type R Engine Oil Results (FL5 & FK8)

READ FIRST – This is a Scientific Thread, Not a Speculation Thread
This thread is strictly dedicated to Civic Type R owners (FL5 and FK8) who are contributing Used Oil Analysis (UOA)data, to build a collective understanding of how various engine oils actually perform under real-world and track conditions.

Post Requirements:
Please ONLY post if you have UOA results from a lab like Blackstone, Speediagnostix, or similar. Each post should include:

1. Oil Brand and Viscosity (e.g. Honda Ultimate 0W-20, Redline 5W-30, Motul 300V 0W-30)
2. Miles on Oil
3. Track Use or Street Use (or mix)
4. Engine Temp Ranges Observed
5. Modifications (Stock or not; e.g. downpipe, tune, etc.)
6. UOA Report Screenshot or Attachment
7. Optional: Oil change interval history or patterns (e.g. every 2K mi / every 3 track days)

Let’s use this thread as a repository of real data, so we can finally move past speculation, internet myths, and unsubstantiated claims about oil viscosity, wear, or performance.

DO NOT POST IF:

• You’re sharing an opinion without UOA data.
• You’re debating viscosity theory without evidence.
• You’re here to argue about brand loyalty or marketing claims.

There are many other threads to explore those discussions. This thread is for data only.

The Goal:
To create a clean, ongoing repository of scientific oil testing data from the Civic Type R community to inform decisions on:

• Which oils protect best under hard use
• How track sessions impact oil condition and wear
• What change intervals make the most sense based on engine wear metals
• What trends emerge over multiple oil changes using the same oil

Let’s keep it respectful, tight, and focused. Please do not comment unless you're sharing UOA results or asking a clarifying question directly about someone’s posted data.

Ideally, run the same oil, at least 3 oil changes in a row to start to get decent data.

If you'd like to give feedback or discuss theories, there are existing separate threads - Let's maintain the integrity of this one.

ONLY THOSE THAT HAVE DATA - PLEASE Contribute

Start Posting Below — Post Your Oil Samples Here!

Let’s build the most useful, data-driven oil performance thread on the internet for the Civic Type R.



============================================================================

Here is my baseline results with Honda Factory Fill and Honda Ultimate 0W-20.

My car was 80-90% used at Laguna Seca, 10-20% on street - mostly to and back from Laguna Seca. The car was run as hard as you can fully OEM Spec.
1.44.87 min Laguna Seca

Motul 300V 5w/30

 

[johnloov]

 

[johnloov]

 

[Tougefl5]

https://cdn.shopify.com/s/files/1/0312/7695/7740/files/2142_Manual_V2.pdf?v=1669131180

 

[johnloov]

Here is a helpful video and information from an expert that explains why the brand of oil doesn't matter, from an expert. If you want the best performance, you need to see the data from the lab to see which oil is protecting your engine the best. Remember brands don't matter. Every brand may have a few super star engine oils that work excellent with your engine, and others that may not.

What shocked me is the Amsoil OE, was one of the worst performing, and the cheapest one, Napa, which is made by Valvoline, was the best. Valvoline tends to have high moly formulation in their engine oils.



I was very wrong in the beginning looking at these bearing tests online, and Lakespeed has shown it's a bogus test.

Here is a video that explains how API SP really does protect very well the cylinder walls. I was surprised by this data, as I thought, an engine oil that has the lowest wear scar was better, but in reality the piston is gliding, floating on the cylinder walls. The chemistry is extremely important, and specific to certain engine types.

Lake speed explains it best:

 

[Tougefl5]

The feeling after a good oil sample

https://www.facebook.com/share/r/165TrYyqTu/

 

[PNEUMA]

Here is a helpful video and information from an expert that explains why the brand of oil doesn't matter, from an expert. If you want the best performance, you need to see the data from the lab to see which oil is protecting your engine the best. Remember brands don't matter. Every brand may have a few super star engine oils that work excellent with your engine, and others that may not.

What shocked me is the Amsoil OE, was one of the worst performing, and the cheapest one, Napa, which is made by Valvoline, was the best. Valvoline tends to have high moly formulation in their engine oils.



I was very wrong in the beginning looking at these bearing tests online, and Lakespeed has shown it's a bogus test.

Here is a video that explains how API SP really does protect very well the cylinder walls. I was surprised by this data, as I thought, an engine oil that has the lowest wear scar was better, but in reality the piston is gliding, floating on the cylinder walls. The chemistry is extremely important, and specific to certain engine types.

With the data sheets you have posted earlier from oil analysis, may I ask you what your opinion is as to the best oil you have used?

 

[Rhorn]

OPs Honda Ultimate Full Synthetic 0W20

This is the Virgin Oil Analysis, meaning this is a baseline of what the Oil looks like.

This is OPs Report from using the oil. You want to look at the cST Viscosity and SUS Viscosity numbers which are at the bottom. These values are important because it is showing how viscous the oil is and how much protection/lubrication the oil is providing the engine

You can see the base values have dropped. This means that the oil had thinned out and is no longer providing the expected lubrication for the engine.

SUS - 11.8 point drop : 60.3 to 48.5

cSt - 3.49 drop : 10.29 to 6.8

I have only used Amsoil Signature Series 5W30 and based on my reports the Viscosity drop values are nowhere near that range.

VOA for Amsoil SS 5W30 With my Report

SUS - 2.6 point drop : 59.3 to 56.7

cSt - 0.79 point drop 10.03 to 9.27

All oil will thin and SUS and cSt values will drop from a VOA simply because the oil is being used and degraded but you can see that with Amsoil the viscosity isnt degrading nowhere the same rate as Honda Ultimate 0W20. Amsoil 5W30 is still maintaining its baseline Viscosity ratings with minimal drop despite the high engine loads of track use. Degradation is minimal and the service interval can be pushed out more. I added 2,000 miles and did 3 track days so the Viscosity Ratings should be lower, but how low? Idk. Im waiting on the results

Another very important spec is the fuel dilution percentage. This is important because our cars are DI and there is always the case of blow by. Dont know fuel details by its bad oil going back into the engine. This is why people add oil catch cans. Unfortunately Blackstone doesn't test for fuel dilution they only guess, other Oil Analysis Companies can actually test for the fuel dilution.

If theres an oil that can mitigate fuel dilution (2% is within acceptable ranges) and still maintain the high Viscosity ratings with minnimal drop compared to the VOA than it would be truly the best oil for our cars

I was recommended Mobil 1 ESP 0W-40 X4 because with Amsoil 5W30 the ~11 cSt rating doesnt have much wiggle room before it degrades to 0W20 levels which is whats going on. Getting one with a 12 cSt rating will give you more wiggle room so it stays in the XW-30 oil range of Viscosity before the Viscosity starts dropping.

Im going to use another company for a UOA to see what the fuel dilution rate is with the Amsoil in the car currently and then I'll try Mobile 1 ESP 0W-40x4.

I was warned against Amsoil 0W40, it'll offer good protection but because its designed to be have extended service intervals, it has alot of detergents and because our cars are sensitive to fuel dilution because of the turbo abd DI there's a possibility it'll increase carbon intake and fuel dilution. Because our cars have a turbo and are DI there are some extra considerations.

Either way the best oil is the one that has high cSt Viscosity ratings, maintains its Viscosity ratings with minimal drop off and has the lowest fuel dilution. Honda Ultimate 0W20 is not that oil

This is a good database of VOA for a bunch of oils

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