Sorry for hi-jacking the thread for a similar issue. My M113 has a slight mechanical "noise" at the left forward part of the engine block. After having this for a month I got a pretty loud tick-tick at startup, almost as when oil pressure is low for a couple of seconds, but this remained for a good minute or two. Then disappeared and didn´t come back on repeated startups until the engine has been stopped overnight.

So I made an oil and filter change, Mobil 1 0-40 as usual. After this I can still hear the tick-tick but much less although for the same good minute.

The slight mechanical noise is the same as before oil change.

What can cause this, it sounds like a single valve tick, but I am not sure. Can anything related to the cam chain and tensioner make a tick and also this lower noise?

Engine runs smooth and no extra exhaust smoke from what I can see.

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