The 167k service

Fresh oil (5W30), new oil filter, new cabin filter and a set of spark plugs (Denso, gapped at 1.0) were in the menu for the day, plus the chain tensioner o-ring replacement.

The last item on the to-do list revealed itself to be rather easy task, with only one single remark, after fitting the chain tensioner in place, the crankshaft must be turned (by hand) counter clockwise. This is done

to release a tiny hook on the tensioner allowing it to extend and apply the correct tension to the chain (i'll leave the YT video link here).

Serviced at 167643km (38199km on LPG).

The chain tensioner o-ring

The engine started leaking a very small amount of oil, after some googling, I came to know that the responsible was the chain tensioner o-ring (it also seems that this is a common issue). 

Got to the dealer to buy a new one and get it replaced in the next service, even found a YouTube video featuring the chain tensioner o-ring replacement, so that shouldn't be to hard.