Hi dustyroads.
First of all thanks for your help.
It's about an engine model (in my case it's K9K 732 engine type) that is comon for Renault, Dacia and Nissan. Big end bearing shells broke suddenly in about 100.000 Km's to 150.000 km's.
Portuguese Renault makes an engine oil analysis at around 100,000 Km's in France but only to cars that do maintainence on the brand, that's no my case. If there are more particles in the analysis, Renault replaces the parts with no cost to the customer.
The new engines come now with different big end bearing shells, further strengthened.
It's bad design, poor lubrication, bad metallurgy, etc. Too many stories from customers and by the Renault but is sure what mentioned in the previous paragraph. I put new oil in 15.000Km 15,000.
There are reports of cars with this engine range that never gave problems and there are others who happens to 80.000 km's, 100,000 Km's ...
Do you believe that through this kind of analysis i can't discover any abnormal wear of any engine part?
It's a sudden death.