A Coruña, Spain – YouTube channel “Andresito” has posted a hard-hitting video about Peugeot and Citroën’s PureTech engine problems, which has affected hundreds of thousands of owners. The video describes the situation as a scandal that has ruined 350,000 families.
The main problem lies in the oil-immersed timing belt, which disintegrates, creating a toxic mixture that damages the engine. This results in loss of oil pressure and, in many cases, total engine failure, even with very low mileage. Belt debris builds up in the oil system, aggravating the problem. Also mentioned is the possible failure of the brake servo due to problems with the vacuum pump.
A problem with deep roots
The video also mentions previous problems with the THP engine, developed by PSA in collaboration with BMW, which had timing chain tensioner failures and carbon buildup in the valves. Despite being initially praised and awarded for its efficiency, the PureTech engine has proven to be a failure. Part of the production of this engine was carried out in China.
Why does the PureTech fail?
According to the video, the rubber belt degrades on contact with gasoline leaching into the oil, especially in cold starts and urban use. The oil-bathed belt-driven motor design is inherently problematic. It is mentioned that Euro5 regulations and gas regeneration could contribute to the problem by introducing gasoline vapors into the oil.
Stellantis’ answer: Too late?
Initially, Peugeot and Citroën seemed to ignore the problem. Stellantis claims to have introduced a reinforced belt on the third generation PureTech, but the video questions this solution, indicating that it is still a belt and not a chain. The PureTech version with chain is only available on hybrid models. Stellantis recognizes problems of excessive oil consumption and low pressure due to belt degradation and has implemented support policies, covering repairs for up to 6 years.
Expert opinion: a design flaw
Mechanics point to premature wear and accumulation of belt debris. An Argentine mechanic explains how belt debris affects oil scraper rings. Experts indicate that the problem is not the belt or the oil, but a bad design of the engine from the beginning. Belt manufacturers guarantee their durability only if they are bathed exclusively in oil, without mixing with gasoline.
Conclusion: Avoid PureTech
The video criticizes the situation as an example of planned obsolescence and suggests that consumers are being pushed towards more expensive hybrid or electric vehicles. PureTech engines with oil-immersed belts should be avoided.
For more information, you can watch the full video on Andresito’s YouTube channel.