In dyno testing, the 2015 GTI produced 235 horsepower and 297 pound-feet of torque running on 93 octane gas. Running E85 fuel on the stock tune bumped that up to 244 hp and 308 pound-feet of torque.

https://www.thedrive.com/news/43516/...than-you-think

 

The thought process that the turbo bois presented is that when you run pure e85, you're injecting 30% more fuel into your cylinder, and that creates more fuel dilution in your oil, and ethanol is good at lowering your viscosity. So they are thinking to start out with a heavier weight oil so you end up at the viscosity you actually want at your oil change.

This is also the reason they say too change it more often, because of fuel dilution in the oil because of the extra 30% more fuel you're burning.

it could all just be internet lore and Bro Science though, sort of like how running E20 in your vehicle will burn up your catalytic converter.

 

Drilling down to the finer details, the Costa-Stile report indicated that higher ethanol percentages approaching 10 percent can have serious negative effects including reducing the viscosity of the oil. This viscosity reduced reduces the film thickness of the oil that protects all wear surfaces – especially in high load areas such as the valvetrain and the rod and main bearings. Plus, the study shows that ethanol in the oil also delays the creation of film formation – which is that critical time where the oil creates a boundary layer between rotating metal parts when the engine first starts. What this means is that even a small percentage of ethanol in the fuel can increase the initial wear the engine experiences during cold start. This is important since as much as 70 percent of total engine wear occurs during cold start.

https://www.streetmusclemag.com/tech...mination-game/

 

Conclusion

This experimental study was conducted to assess the impact of bioethanol–gasoline blends, on the tribological performance of engine oil under selected conditions using four-ball wear tester. The results of the degradation of properties, friction, and wear losses of the contaminated engine oil have been thoroughly discussed. The conclusions can be drawn as the followings:• The 6% addition of all bioethanol–gasoline blends to fully-synthetic oil significantly decreased the viscosity of the fresh oil to about 30%, compared to fresh synthetic oil. The decrease in viscosity from ethanol dilution may result in the thinner boundary film and higher wear because viscosity reduction causes more contact between asperities of the surface.

• Bioethanol–gasoline diluted oils show slightly higher the acid number, compared to fresh synthetic oil. The engine oil needs to be more alkaline to prevent the metal surface from corrosion. However, bioethanol is more chemically reactive compared to gasoline, which enhances the degradation of the fuel–oil mixture. Therefore, the fuel diluted lubricants contain more acidity making the surface more susceptible to corrosion, thus increasing wear losses.

• The addition of ethanol–gasoline fuels to synthetic oil shows that there is no clear trend or conclusive indication of each fuel–oil mixture is worse for friction at both loads, but during the test, it was shown that the ethanol rapidly and fully evaporated from the lubricant at the temperature of 75 °C. This minimal effect on the friction behavior is also due to the fact that the tests were conducted under boundary lubrication regime.

• Although bioethanol fuels have slight impact on the frictional characteristic of the oil, it has significant differences in the amount of wear. At both 40 kg and 80 kg loads, fuel–oil mixtures increase wear losses more or less with the increased amount of bioethanol, compared to their fresh oil. E30–SO and E85–SO have higher wear losses but low friction because acid corrodes the surface and causes additional corrosive wear. From the SEM of the worn surface of tested ball, it can be seen that the worn surface of the fuel–oil samples has more surface deterioration than fresh oil. Additional damage and chemical wears (oxidative wear and corrosive wear) can be investigated on the surface of the ball tested with these oils.

Overall, it can be concluded that 6% of bioethanol fuel dilution can degrade properties performance (viscosity and alkalinity) and tribological behaviors of the synthetic oil. Ethanol fuel dilution may reduce friction, compared to pure gasoline due to its polarity and acidity. However, high acid in the oil causes high wear due to its corrosion on the surface, suggesting that ethanol-resistant engine oil should be produced in order to avoid serious wear from bioethanol.

https://pubs.rsc.org/en/content/arti.../ra/c7ra00357a

 

There are big flaws in most of those. I would say get your own oil analyzed and make your own conclusion. You really cant "fudge" what is found in the oil but you can post anything on the internet that will support anything you want to believe in. The key I posted had directly was the health of the engine. I am willing to bet that very few did a complete health check and evaluation prior the testing they did. Once again if they had they would have made that part of there information. The way we look at it is call the 5 steps in the scientific method. Which I am finding more and more do not seem to follow anymore. rolmao.

I do recommend if you are going to post DYNO runs that you find the RARE videos that show the base line information on the program what was set up and also the exact repeated Dyno runs. Without those which are rare for obvious reason you can see that not all is as you would think.
Or get you own done and make you own conclusion specifically for your use. But have the Dyno operator give you all the DELAT"S even if you don't want to share and post them.

I can still find what some call proof that the world is flat..... rolmao

 

Good idea, the proof is in the pudding, I should do oil analysis and know for sure.

Speaking of being scientific, and holding you to your own exemplary standards. Do you have any empirical data showing that running E30 on a stock tune burns out catalytic converters on a mazda, or other vehicles?
I would like to study this data for ways to mitigate the problem.

 

No . I don't collect that information unless I personally test something. This is simply collected morning coffee chat between a few friends much smarter then me. One is an actual "ROCKET ENGINEER" working in Vandenburg (but that's all I can tell you about him LOL) If you do the research and understand what the components are in a CAT and what outside elements effect it and can deteriorate them. Or......... wait until you get an annoying PO421.
The other thing you might want to try out...
Do a WOT pass to REDLINE, shut the engine off without changing the throttle position . Safely pull to the side of the road and pull any spark plug and have a look at what your cherished fuel is doing to a spark plug.

 

The fact is ,all this is very interesting to gear heads looking for more horsepower but the average CX5 buyer and owner is more interested fuel mileage and reliability. E85 is not going to give you better fuel mileage (E85 gets 15% to 27% fewer MPG than gasoline ) ,and MAY adversely reduce engine reliability and longevity . CX5 buyers who want a bit more power can buy the turbo version and use 92 octane. The CX5 would need better upgraded transmissions, brakes and suspension to handle more power . Look at the Honda Civic type R if you want more power , they got that thing right . The reason 99% of us bought the CX5 is because it's designed to deliver good driving dynamics, transportation at a great price while looking good and delivering great reliability , KODO DESIGN .As far as ethanol/e85 goes it was never anything more than an effort to reduce air pollution /emissions from vehicles it may make slightly more power ,but at the expense of fuel mileage . In the long run we are far better off using corn as food . If you want to see some real air pollution , check out jet planes and trains .

 

That is a interesting opinion.

They way I look at it is, i can buy government subsidized race fuel that improves the vehicle dynamics and daily drivability and reduces mpg by maybe 5 percent because i am only running E20.
I can only get 91 octane where I am.
This mod is free and so easy a 5 year old can do it.
my mazda finally zoom zooms a little bit on E20.

 

It's 2023 going on 2024,if i truly want power and to go fast I will get an EV . Ethanol in everyday transportation vehicle is not the answer . Corn is better as a food source .