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2020 Accord 1.5L Turbo Manual transmission

  

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Topic starter

Hi, does anyone know if the Accord Sport 1.5 L Turbo manual transmission has the oil dilusion problem? I heard about civics and crvs but nothing on the accords. Thank you in advanced 


5 Answers
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The short answer is that Yes, possibly, however, (all) internal combustion vehicles experience "oil dilution" to a degree which is why there is always some form of Positive Crankcase Ventilation valve (PCV) system to help those gasses safely return to the intake and combustion system.

------ for the 2016 - 2018 CR-V & Civics, Honda has indicated that they have adjusted the engine computer software (fyi - software that controls hardware and programmed onto chips is called Firmware) which will adjust the air/fuel ratio (especially during cold starts) and ignition timing to help reduce too much fuel entering the cylinders and also help the car warm more quickly so the engine will lean out the air/fuel mixture more quickly.

------ Now this said, it is very important to understand a few things that contribute to Oil Dilution.  1) Blow-by: Combustion gasses will always leak past the rings to some degree (this is one reason the oil gets dirty) 2) Worn piston rings: allow more combustion gasses into the crankcase (even more as the engine ages) 3) Turbo units: are the bane of engines and can dramatically increase combustion pressures on the piston and rings (among other internal parts) which will of course increase blow-by gasses 4) Incorrect Octane can cause pre-ignition which can cause additional pressures / combustion gasses pistons & rings 5) Incorrect timing, clogged fuel injectors, Driving habits, etc. all can factor into the issue. 

------- I expect that Honda would very likely have migrated the same (or better) Firmware (FW) patches from the 2016 - 2018 issue to the 2019, 2020 and later vehicle engine (FW) so it "should" address the issue, but FWIW, and IMHO, I expect the issue is (more likely) a combination of factors (not just FW related) but more likely related to a combination of Injector assembly, FW code, Sensor feedback, Turbo cold air pressure (especially when vehicle is cold), etc.

------ Recommendations: If it was me, I would do the following: 1) Regularly check for gasoline smell in the oil (you'll know when you smell it) 2) Be mindful for unexpected gas smell in cabin / cabin air or outside the car 3) Be mindful of engine ping / knock (which could be the result of incorrect octane or too much (oil dilution) gasses in the crankcase 4) Warm the vehicle completely before driving 5) DON'T beat the Turbo! (especially when cold!) 6) Change your oil at very regular intervals (say 3K miles) 7) If you smell anything gas related out of the ordinary take it to the dealer and complain so that there is a record of it (and you keep a copy)! If it's not documented, it never happened!


This post was modified 5 years ago by RonJr
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A member here has the 2.0T Accord and has, though to a lesser degree, oil dilution. The 1.5T would be more prone to that issue, but Honda claims they fixed it with a software fix, so as long as you maintain it you should be fine. 

I looked online to see what owners of the Accord were experiencing. Honda claimed to fix the issue in 2019 I believe for the Civic and CR-V... On carcomplaints, the 2018 Accord had multiple reports of oil dilution but ALL of them had the 1.5T engine, not the 2.0T engine. Consumer Reports notes that they got oil dilution reports from hotter climate states like California and Texas. @mod_man also has an experience with a 2020 Accord 2.0 Turbo.

I don't see the same reports with the newer ones but your best bet would be to keep up on oil changes take care of it maintain it if you do have the issue check if you could get a software fix...


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Basically, what @Kerem said. Maintenance is key. I am pretty sure the only reason I'm seeing dilution is because I'm in Texas, so hot climate typically. Since it has been cold here I've not seen anything.


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Yes.  The 2.0 and 1.5 are both susceptible to oil dilution.  See here:

https://carkiller.com/scottykilmer/qa/honda-earth-dreams-engine-2019/#post-66100


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Topic starter

Thank you, very good information. 


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