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Corvalis TTX
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Someone asked the question so I answered based on my own personal experience with turbo engines and research over the years, including some oil analysis done on my own vehicles. I am by no means an engineer. I offered my opinion. I try to do 5k oil changes regardless of mm. (edit) If your mm is 0% before 5k then yeah absolutely change it. There is clearly logic in the MM with regards to temp, operating conditions, etc so If you are at zero after 1000 miles, that's one thing. But I think 5k is quite reasonable for a high performance direct injected turbocharged engine that runs 20psi and on 87 octane fuel and severe conditions.

My wife's CRV with the 1.5 engine is still a diluter, even after the TSB. The level visibly rises on her dipstick over time. My 1.5 EXT was a diluter, but to a lesser extent. Such is the nature of most TGDI engines. I have not heard of many engine failures due to dilution, but I would rather be safe than sorry. The CRV has over 50k miles in 2 years. Hoping for another 100k.

I note that you're basing your oil change intervals on feelings rather than on data. Which is fine for you and your vehicle. Your assertion (stronger than an opinion, BTW, despite your protestation to the contrary) that if you want engine longevity you should never let the MM get below 15% is pure garbage however, with nothing scientific to back it up. Whether or not other readers follow your recommendation is up to them, but you have presented no real data to convince anyone that they should.

You used the figure of 15% as the threshold. Why not 20% or 10%? How did you come to the conclusion that 15% was the proper figure?
 

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Past Doritos Spinner
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4,053 Posts
I note that you're basing your oil change intervals on feelings rather than on data. Which is fine for you and your vehicle. Your assertion (stronger than an opinion, BTW, despite your protestation to the contrary) that if you want engine longevity you should never let the MM get below 15% is pure garbage however, with nothing scientific to back it up. Whether or not other readers follow your recommendation is up to them, but you have presented no real data to convince anyone that they should.
I have a feeling that the fuel dilution is like the VTC rattle on the 8th Gen I4 engines. It's irritating, but at the same time, I am not seeing widespread engine damage caused by it or there would be a class action lawsuit for it(like the 8th Gen V6 VCM, which actually causes engine problems). Honda also extended the warranty on the 1.5T Civics(not sure about the Accords or CR-V), so if something does go south, there is that.

You can spend money to make you feel better(change oil more frequently/change out the VTC actuator), but it's also not really doing any damage, so... you can just leave it.
 

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I would never go below 15% MM if you intend to keep a turbo engine running for the long run.
Unlike.

Sky is falling mentality......

I've ran my 2.0 1000-1500 miles past the MM for convenience reasons the last couple oil changes; this has equated to oil change intervals of 12,800 and 13,400 miles. This engine loafs along at 2000 rpm (at 85 mph!) for the majority of it's operation and in no way whatsoever requires 5000 mile oil change intervals. It's some of the cleanest dirty oil I've ever seen when it's drained at 12K plus miles. I'm actually pretty sure it'd easily go 15K or more (never had an OA), but will stick to in the ballpark of what Honda recommends.

No Chicken Little for me.
 

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2019 Accord Sport 2.0T 6 Sp Manual
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13 Posts
I am surprised to read through 22 pages of comments and only see a single oil analysis report.

I have been in touch with Honda Canada, and am waiting to hear back from some Honda engineers at the moment (been waiting for a week) to explain the extremely high (in the 99th percentile) (Silicon and Aluminum) (see page 2) concentration of abrasives found in my first change oil. Not very impressed with the MM so far myself. High abrasives - especially in "Unacceptable" or "Severe" is very concerning. If that is all from break in, I would rather have two shorter oil changes myself to flush that out faster. If it is not from break-in, I may have a problem with my Accord.

Notes on sample:
Sport 2.0T 6 Speed Manual
Changed at 5%.
Commute to work is about 80km each way with 95% highway miles.
Sample pulled mid stream at about 30% discharge state.

I will not be waiting to 5% again without further testing.

Anyone else have first change oil analysis data? A lot of speculation of feelings and who to "trust" but little actual data I have seen so far.
 

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2019 Accord Sport 2.0T 6 Sp Manual
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13 Posts
That is a pretty good article.

That article does call out that a 3 to 1 ratio of Si to Al can indicate dirt, also elevated SI with Al was part of Case study 2 indicating improper cleaning after a sanding disk use. At this point, I cannot be sure one way or another. It could be as simple as gasket material and initial wear Al.

With numbers this high, I am disappointed that there was not a early oil change interval recommended.

Looking forward to seeing what the engineer from Honda explains.

Anyone else getting similar numbers? So far the only other test I have seen had numbers lower.
 
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