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2018 Accord 1.5T - Strong Fuel Smell in Oil / Oil Dilution

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Nicole W. · rep 0 · May 22, 2:42 AM · 1 replies · solved · Question

Vehicle: 2018 Honda Accord Sport 1.5T

Hello everyone, I own a 2018 Honda Accord Sport with the 1.5T engine, and it has about 60,000 miles on it. For a while now, I've been noticing a strong smell of gasoline when I check the oil dipstick. It's very distinct, not just a faint whiff. I also feel like the oil level sometimes appears higher than it should be, which makes me suspect oil dilution.

I mostly do short commutes, but I also take it on longer trips occasionally. I'm worried about the long-term effects of this on the engine. Is this a common problem with the 1.5T, and what can be done about it?

Has anyone else experienced this with their 2018 Accord? What was the fix, if any?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:42 AM

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ClearTheCode admin answer:

The issue you're describing with a strong fuel smell in the oil and potential oil dilution is a well-documented concern for Honda's 1.5T engines, particularly in models like your 2018 Accord, especially for vehicles driven primarily on short trips or in cold climates.

  1. Fuel Dilution: This occurs when unburnt fuel bypasses the piston rings and mixes with the engine oil in the crankcase. The 1.5T engine's direct injection system, combined with its tendency to run rich during cold starts and warm-up, can exacerbate this. Short trips don't allow the engine to reach optimal operating temperature long enough to evaporate the fuel from the oil.
  2. Long-Term Effects: Fuel-diluted oil has reduced lubricating properties, which can accelerate wear on critical engine components like bearings, camshafts, and cylinder walls. It also degrades the oil faster, necessitating more frequent oil changes.
  3. PCV System: A malfunctioning Positive Crankcase Ventilation (PCV) system can also contribute, though less commonly the primary cause for this specific issue.

Diagnostics:

  • There typically won't be a specific OBD-II code for fuel dilution itself, as it's a characteristic of engine operation rather than a direct fault. However, a check engine light might appear for related issues if the fuel system or emissions are affected (e.g., P0420 - Catalyst System Efficiency Below Threshold).
  • A mechanic can perform an oil analysis to confirm the percentage of fuel dilution, which provides concrete data on the severity of the problem.

When to See a Shop:

  • Soon: If you're noticing a very strong fuel smell, or if the oil level is consistently rising. While Honda has issued service bulletins and extended warranties for some models related to this (often referred to as 'oil dilution fix'), it's crucial to have your specific vehicle checked.
  • A Honda dealership is best equipped to handle this, as they will be aware of any applicable service campaigns or software updates designed to mitigate fuel dilution by altering fuel injection timing and engine temperature management. They can also advise on more frequent oil changes with the correct oil viscosity.
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