What is the reason for oil traces in the Envision's air duct?
2 Answers
The reason for oil traces in the Envision's air duct is: Engine oil will volatilize slightly under high temperatures, and the resulting oil mist can easily be absorbed by rubber hoses in the engine compartment, which is a normal phenomenon. Taking the 2020 Envision as an example, it is a mid-size SUV with body dimensions of: length 4694mm, width 1839mm, height 1686mm, wheelbase 2750mm, and a fuel tank capacity of 66 liters. The 2020 Envision is equipped with a 1.5T inline 4-cylinder turbocharged engine, with a maximum horsepower of 169PS, maximum power of 124kW, and maximum torque of 250Nm.
I've noticed that oil stains on the Envision's air intake pipes are quite common, usually due to issues with the Positive Crankcase Ventilation (PCV) system. This system is responsible for venting engine oil vapors. If the valve gets clogged or the pipes become damaged, high-pressure gases carrying oil can enter the intake pipes, leaving oil stains. Neglecting this can lead to dirt buildup, blocking the intake system and affecting combustion efficiency, resulting in reduced power and increased fuel consumption. As someone who regularly maintains my car, I check these components periodically, cleaning the pipes or replacing worn parts every six months to prevent issues before they arise. I recommend first inspecting the PCV valve and connecting hoses for aging, as they're the primary source, to avoid minor issues turning into major problems.
