Yeah they say valve clearances every 30k but most on here have found that after the first 30k adjustment it only really needs doing every 80k. Mine has only ever had two adjustments in its whole 160k km life.. getting due for it third now.. Will do injectors at same time at 180k even though it runs sweet.
So back to you.. drain your tank and change your filter, install finer 2um secondary filter, get dealer or your mechanic to do valve clearances, do SQL, will need to be done by dealer as only they will have mutt2.
They'll have your manifolds off to do tappets so have them cleaned up whilst they're at it.. And If were me I'd just change injectors while they're at too... be on safe side, that's just me, cheap insurance as reality with these stupid common rail diesels. Love em but hate them at same time.