New lubricant standard for Stellantis FPW9.55535/03

D

DC11

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Feb 19, 2023
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Any toughts on subject "Stellantis group goes from 0w30 to 5w30 in order to prevent chain wear"? First time I've seen impact of low W viscosity on chain wear.
"In December 2023, the dealers of the Citroën, DS, Opel and In December 2023, the dealers of the Citroën, DS, Opel and Peugeot have received a technical note indicating : « Research work and mechanical tests carried out have shown that the use of a specific engine oil had a positive impact on the reliability of DV5R engines in service produced before February 2023. » Thus, the Stellantis group recommends the use of a 5W30 lubricant instead of 0W30. The difference ? The viscosity is higher when cold start. « This new standard Stellantis FPW9.55535/03 aims to reduce’wear and preserve the service life of mechanical components », is it specified. Source: https://www.largus.fr/actualite-aut...iter-la-casse-30031534.html?at_medium=custom3
 
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There was a Nissan technical paper floating around that showed the relation between timing chain wear and the Winter rating of oil. I don’t have it readily available, but @Cujet succinctly sums it up the findings.
 
Should probably be noted that this is a diesel engine.

The previously recommended lubricants were:
PSA B71 2312 0W-30
PSA B71 2010 0W-20

These are C2 oils with an HTHS of 2.6-3.0cP

This new lubricant recommendation is for a C3 oil, which has an HTHS of 3.5cP or higher.

So, I'm not sold on the idea that it's the Winter rating in play here. I expect it's the HTHS.
 
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