Used Honda 1.5T Oil Dilution: What to Check Before You Buy

Oil dilution on a used Honda or Acura with the 1.5-liter turbo means unburned gasoline is mixing into the crankcase, which can push the oil level above the dipstick's full mark and leave the oil smelling like fuel. Check the dipstick on a cold, level car, ask a Honda dealer to run the VIN for the software updates and warranty-extension bulletins Honda actually published, and treat a "it was updated" claim as something you verify. Honda's extra powertrain coverage on the 2016-2018 Civic and 2017-2018 CR-V was a six-year clock from the original sale date, and for almost every car that window has already closed.

Car and Driver reported in October 2018 that Honda said the problem mostly hit 2017 and 2018 CR-Vs driven in colder areas on short trips, because fuel that mixes into the oil does not burn off when the engine never gets fully warm. Consumer Reports described the same irregular high oil level in those 1.5-liter CR-Vs and noted Honda's position that it did not see a safety defect, even as owners reported stalling and loss of power. That is the used-car version of the headache: the listing looks fine until you pull the dipstick and it comes up looking overfull and smelling like the gas station.

How to spot it before you fall in love with the car

Park the car on level ground, wait until it is cold, and pull the dipstick. Oil that sits well above the upper hash and smells sharply of gasoline is the tell Honda owners have been chasing since those first winters. A hard cold start, a misfire, a rich-running complaint, or a "whirling" noise from the engine bay matches the symptom list Honda later put in its warranty-extension bulletins. Those bulletins name diagnostic trouble codes P0300, P0301, P0302, P0303, P0304, and P0172.

Ask when the last oil change was, and ask to see the invoice. An owner who has been changing oil every 1,000 miles "just to be safe" may be managing dilution rather than following the maintenance minder. Smell the oil cap. Look at the service screen for remaining oil life that does not match how the dipstick looks. If the seller will not let you check the oil, walk away. That is not a negotiation tactic. It is the cheapest test you have.

What Honda put in writing

On April 5, 2019, American Honda sent dealers a message announcing a warranty extension for certain 2016-2018 Civics and 2017-2018 CR-Vs "due to drivability concerns" tied to engine oil dilution from control-unit software thresholds, with possible camshaft and rocker-arm damage. Honda said it was extending powertrain coverage on the camshafts and rocker-arm assemblies from the original 5 years/60,000 miles to 6 years with unlimited miles from the original sale date. The same note said most affected vehicles would need only a software update, and it pointed dealers to product-update bulletins 18-114, 18-124, 18-137, and 19-025 before the diagnostic bulletins.

The later service bulletins fill in the details. Bulletin 19-033 (I fetched the January 11, 2023 revision) covers 2016-2018 Civics with the 1.5-liter engine; eligibility is VIN-specific. Bulletin 19-032 (the April 12, 2024 revision) covers 2017-2018 CR-V EX, EX-L, and Touring; again, dealers are told to check Honda's iN VIN status. Both extend the powertrain warranty from 5 years/60,000 miles to 6 years with unlimited mileage from the original sale date for engine components (the examples given are camshafts, rocker-arm assemblies, or spark plugs) damaged by the listed drivability concerns. Both say ECU and TCM software remains covered under the emissions warranty beyond those six years. Both exclude vehicles that were declared a total loss, sold for salvage, or given a branded title. The corrective action is a software update, an oil change, and, in some cases, an A/C control-unit replacement, with a follow-up path if misfire codes return.

Car and Driver also reported that the 1.5-liter turbo in the 2017-2018 CR-V sat in EX, EX-L, and Touring trims, and that LX models with the 2.4-liter four were not part of that oil issue. Honda told C&D it would not issue a safety recall because it had not identified a safety impact, and that 2019 CR-Vs would be addressed before they went on sale. I did not find a matching U.S. warranty-extension bulletin for the Accord 1.5T in the Honda communications I pulled. If you are shopping an Accord or an Acura with the same engine family, still check the dipstick and still have a dealer run the VIN. Do not invent coverage that is not on the screen.

The six-year clock, as of November 2026

Add six years to the original sale date on the title or on a dealer printout. A Civic first sold in 2016 aged out in 2022. A 2018 CR-V first sold in late 2018 aged out in late 2024. Sitting here in November 2026, almost every car named in 19-032 and 19-033 is past that extra powertrain window. A leftover 2018 that somehow first sold in 2020 would be a rare exception, and you should not count on being that exception. The bulletins do leave ECU and TCM software under the emissions warranty after year six, so ask the dealer in writing whether any software campaign is still open on that VIN. Our factory warranty status check is the broader version of that conversation.

Honda's own bulletins are VIN-specific. Year and trim get you close. They do not finish the job. Have the service desk run an iN inquiry and ask, by bulletin number, whether 19-032, 19-033, 18-114, 18-124, 18-137, or 19-025 shows as completed or not applicable.

What a history report will miss

Honestly, a history report is still worth pulling, just not for the reason people hope. It may show dealer visits, repeated oil changes, a camshaft replacement, or a software update if that store's records flow through. It will not print "oil diluted with gasoline" as a status line. It also will not tell you the current dipstick level. We explain the difference between a bulletin and a recall in our TSB versus recall guide, and the safety-recall side lives in our Honda recall check by VIN. If you are not sure you are even looking at a 1.5T, decode it first with our Honda VIN decoder or the engine-type lookup.

We sell licensed CARFAX and AutoCheck reports. That does not make us CARFAX, AutoCheck, or Experian, and you should not expect a free full official report from us. Plan on roughly $5.50 as a guest or $4.50 as a member, or about $6.75 for the bundle, versus the $39.99 to $44.99 you'd often pay going direct. Confirm at checkout, since the total can move. Skip the seller's phone screenshots. We've seen cropped report images where the only interesting service line sat just below the fold.

Sources

• Honda dealer message (April 5, 2019) announcing the oil-dilution warranty extension
• Honda service bulletin 19-033 for 2016-2018 Civic 1.5L
• Honda service bulletin 19-032 for 2017-2018 CR-V EX/EX-L/Touring
• Car and Driver: 2017-2018 CR-V oil issue (Oct. 8, 2018)
• Consumer Reports: Honda CR-V engine oil troubles
• NHTSA: Check for recalls