A Coruña, Spain – An in-depth technical analysis reveals the root of the problem plaguing PSA (Peugeot, Citroën) and Ford EcoBoost 1.0 and 1.2 PureTech engines: oil contamination with gasoline. This video uncovers how this fuel, and not the oil itself, is the main culprit in the premature degradation of wet timing belts designed to operate in a lubricated environment.
The video explains that, although these engines were awarded for their efficiency and low emissions, the reality is that gasoline leaks into the oil, especially during cold starts and idling. This phenomenon, known as “blow-by”, occurs when unburned fuel passes the piston rings and mixes with the oil.
Gasoline, the silent enemy
The nitrile material of the belts reacts negatively to gasoline, causing them to dry, crack and shed particles. These particles clog the oil lines, the filter and the “sucker”, causing poor lubrication and ultimately serious damage to the engine, including seizure. The video highlights that this problem is more frequent in vehicles used for short and infrequent journeys, as the oil does not reach sufficient temperature to evaporate the gasoline.
Beyond the belt: other components at risk
The video warns that belt debris not only damages the engine, but can also affect other components, such as oil pump actuators and camshafts. Even the braking system can be compromised, as the vacuum pump can also become clogged.
What to do?
The video emphasizes that users are not to blame and offers the following recommendations:
- Visually inspect the belt through the oil filler cap for cracks or fraying.
- Change the oil annually, regardless of mileage.
- Be aware that these belts will not last as long as the manufacturers predict.
The video concludes that while the idea of wet belts was intended to reduce friction and improve efficiency, the reality is that a design with traditional belts or chains would have been more durable.
For more information, you can watch the full video on YouTube.