exhaust manifold gasket leak

[Sergiu]

This morning I've spotted an oily soot trail around cylinder#5 exhaust port. 6500 miles after my previous PM and oil is still at the full mark. Should I start worrying about ?

[Mr Hagg]

did you let truck idle for a period of time?
A small leak i wouldnt be that worried about but keep an eye on it.
Could be valve guide seals or piston wet stacking. They will do sometimes when idling.

[Hammerhead]

Agree with Mr Hagg, that's a monitor condition, along with time to start saving for "manifold gasket and possible v/g seal replacement fund".
You're not in critical condition, but it's something you should prepare for

[Mr Hagg]

Also Id check crankcase filter it may be time to change. And TBH id go with the maintenance free one.

[Sergiu]

Engine has been idleing since last night. Thanks for advice!