My employer spent a lot of effort on oil analysis last year, due to far too many Stellantis engines going bang.
Some workshops have been changing oil annually regardless of mileage, while some have been sticking to the 18000mile interval.
Analysis results showed no oil samples were degraded beyond serviceable life by quite some margin, and engine failures didn't appear related to how often the oil had been changed, with similar failure rates across all workshops.
We had one sample show high metal content, which I think is now one of two currently parked outside having gone bang.
Some workshops have been changing oil annually regardless of mileage, while some have been sticking to the 18000mile interval.
Analysis results showed no oil samples were degraded beyond serviceable life by quite some margin, and engine failures didn't appear related to how often the oil had been changed, with similar failure rates across all workshops.
We had one sample show high metal content, which I think is now one of two currently parked outside having gone bang.





)

