Honda CR-V 1.5T Oil Dilution Extended Warranty Update: Valid Years and Fixes
You check your oil dipstick and it smells like gas, or worse, the level is actually higher than when you last changed it. For owners of the 1.5-liter turbo CR-V, that sinking feeling is all too familiar.
Honda has acknowledged this issue and rolled out fixes and warranty extensions. Here’s the straight story on what years are covered, what the fix actually does, and what you need to do.
TL;DR
The oil dilution issue mainly affects 2017-2018 Honda CR-Vs with the 1.5L turbo engine in cold-weather states. Honda issued a product update (software reflash + oil change) and an extended powertrain warranty to 6 years/unlimited mileage for affected components. A class-action settlement was finalized in 2022 covering these model years. While 2019+ models saw factory updates, some early builds in cold climates may still show symptoms.
What’s Actually Happening?
In the 1.5L direct-injected turbo engine, a small amount of unburned fuel can slip past piston rings and mix with engine oil. This is normal in small amounts—the engine heat usually vaporizes it. But in short trips and very cold weather, the engine doesn’t warm up enough to burn it off. Over time, the fuel accumulates, diluting the oil and reducing its protective properties.
Symptoms to watch for:
- Oil level rising on the dipstick
- Strong gasoline smell from the oil
- Misfire codes (P0300, P0301-P0304)
- Rich running code (P0172)
- In rare cases, engine whirring noise from camshaft wear
The Valid Years
| Model Year | Affected? | Notes |
|---|---|---|
| 2017-2018 CR-V | ✅ Yes | Primary affected years; warranty extension and software fix available |
| Early 2019 CR-V | 🟡 Some | Most 2019 models had updates from factory, but some early builds in cold climates may still show symptoms |
| 2020+ CR-V | ❌ No | Engine management updates incorporated at factory; reports declined significantly |
Important Note: The problem is most common in 21 cold-weather states (Alaska, Connecticut, Illinois, Indiana, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, Nebraska, New Hampshire, New Jersey, New York, North Dakota, Ohio, Pennsylvania, Rhode Island, South Dakota, Vermont, Wisconsin). But Honda has also issued a service bulletin covering the unlikely possibility of it occurring outside these states.
The Warranty Extension
Honda extended the powertrain warranty for affected vehicles to 6 years from the original purchase date with unlimited mileage.
Specifically covers:
- Camshafts
- Rocker arm assemblies
- Spark plugs (if damaged by oil dilution)
- Other engine components damaged as a direct result of oil dilution
This extension was primarily offered as “reassurance” for owners concerned about varying oil levels. Honda noted that abnormal oil dilution remains extremely rare outside cold-weather regions.
In Canada, the warranty extension is 6 years from initial vehicle registration with no mileage limit.
A U.S. class-action settlement was finalized in 2022 covering 2017-2018 CR-Vs and certain Civics.
The Fix: What the Dealer Does
If your 2017-2018 CR-V is affected, the dealer performs:
- Software updates to the PGM-FI (engine) and TCU (transmission) control units
- Replacement of the A/C control unit (on certain vehicles) to improve engine warm-up logic
- Engine oil and filter change to remove contaminated oil
- Throttle position reset and PCM idle learn procedure
What the software does: Adjusts fuel injection timing, CVT control, and A/C operation to help the engine warm up faster and retain heat, reducing the chance of fuel accumulating in the oil.
What Owners Are Saying
The good: Many owners with 2017-2018 CR-Vs report the software update resolved their issues. One owner noted oil levels stayed stable even at -15°C after the update. Honda says 2019+ models have the fix from the factory.
The cautious: Some owners still report issues after the update, especially if they primarily drive short trips in very cold weather. A 2025 update noted that while 2019 models saw improvements, “the 1.5T engine remains the same as before, with no substantial changes” and some owners in cold regions still report symptoms.
The takeaway: The software update significantly reduces the risk, but it doesn’t eliminate the fundamental physics of direct injection in extreme cold. Taking longer highway drives occasionally helps burn off residual fuel.
Chart: Oil Dilution Fix Effectiveness
Comparison Table: CR-V Oil Dilution Fixes by Model Year
| Model Year | Fix | Coverage | Notes |
|---|---|---|---|
| 2017-2018 | Software update + A/C control (select) + oil change | 6 years/unlimited mileage warranty | Go to dealer with VIN; class-action settlement covers these years |
| Early 2019 | Factory software update | Limited (may require dealer check) | Most are fine, but cold-climate owners should check |
| 2020+ | Factory updates incorporated | Not applicable | Issue largely resolved |
FAQ Section
1. Which Honda CR-V years have the oil dilution problem?
The primary affected years are 2017-2018 CR-Vs with the 1.5L turbo engine, especially in cold-weather states. Some early 2019 models may also be affected.
2. What is the warranty extension for the 1.5T oil dilution?
Honda extended the powertrain warranty to 6 years with unlimited mileage for 2016-18 Civics and 2017-18 CR-Vs. A class-action settlement finalized in 2022 covers 2017-2018 CR-Vs.
3. How do I know if my CR-V has had the oil dilution fix?
Call any Honda dealer with your VIN. They can check if the software update (TSB 19-032) has been performed and if any warranty extensions apply to your vehicle.
4. What does the oil dilution fix actually do?
The dealer updates the engine (PGM-FI) and transmission (TCU) software, replaces the A/C control unit on some vehicles, and changes the oil. The software helps the engine warm up faster to burn off fuel before it accumulates in the oil.
5. Is the oil dilution problem fixed on newer CR-Vs?
2019+ models had the updates incorporated at the factory. Reports declined significantly, though some early 2019s in cold climates may still show symptoms.
6. What should I do if my 2017-2018 CR-V has oil dilution?
Contact a Honda dealer with your VIN to check if the software update has been performed. If not, schedule the service—it’s often free under warranty. Also consider more frequent oil changes in winter and occasional highway drives to burn off fuel.
Final Thoughts
Always remember: Oil dilution is a known characteristic of direct-injected turbo engines, especially in cold weather. Honda’s software update and warranty extension address the issue, but they don’t completely eliminate the physics at play.
If you own a 2017-2018 CR-V, check your oil level regularly, especially in winter. If you smell gas or see rising levels, get to a dealer. The fix is likely free, and the peace of mind is worth the trip.
Have you had the oil dilution update done on your CR-V? Did it resolve the issue? Share your experience in the comments below.
For further reading (Honda CR-V oil dilution updates and official documents):
