So had the job done and it's confirmed it was the timing chains. Sounds and feels much better especially as I cleaned up the injectors prior to the garage doing the chain job.
I took it to a local Auckland mechanic who is known for working on these and he thinks it's the timing chain. I'll either do it myself or get it done and report back in what it was....thanks for your replies.
What's your pick, bearing rather than chain??
2011 Thai Built Nav, getting up there with 340k's.
This is post oil change - the noise has been slowly becoming evident..
Any wise heads who have heard this before?
Navara engine run