Some question for L405 owners !

Hello Good People - Long time lurker but not too many posts - so thanks to all the contributors - certainly a wealth of knowledge out there.

Im pondering an update model L405 TDV8 apart from some revised lines, lights seats and bling (facelift) are there any material mechanical under the skin changes that happened with the facelift from the pre 2018/19 update - for example I know the very early 4.4TDv8s had some issues and there were incrementally revised - timing chains rollers etc. I cant seem to find a definitive source of information on the under the skin stuff.

We have a L494 (2017) and have done the dreaded oil cooler orings - all fine now. I was wondering if the 2018/19 update may have addressed some of this issues. Any suspension or transmission tweaks?

Thanks and Regards

Steve