Join Date: Sep 2011
Location: Manitoba, Canada
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I was interested to know the technical explanation behind the VVTi oil line failure. Here is an excerpt from Toyota Canada's response:
"Toyota has determined that on affected vehicles, the rubber portion of the engine oil supply hose for the VVT-I actuator on the cylinder head may develop a small crack due to the use of improper rubber material. These cracks can develop inside the oil hose from exposure to small amounts of corrosive components in positive crankcase ventilation (PCV) gases. If the vehicle is continuously operated in this condition, the crack in the hose may expand as a result of the oil pressure and engine oil may leak from the oil hose which can eventually cause damage to the vehicles engine."
I don't see why the new and properly designed hose (using the proper rubber) would give any problems. I agree, the metal hose is probably a fool proof solution, but having said that, there are many rubber hoses used in all makes and models of vehicles on the road today without issue. In this particular instance, some Toyota engineer/supplier/ or whomever spec'd the wrong type of rubber for the job....leading to a costly mistake.