Hi there ...
Just after some advice ... our i30 Tourer diesel has done 127,000km of trouble free motoring. Aside from upcoming trailing arms that will need replacing at some stage, our mechanic sometime last year advised me there was quite a bit of oil buildup on the engine block.
Careful investigations by myself after I degreased everything clean, revealed one (or maybe more) of the bolts fastening the inlet manifold to the engine block, has been weeping oil - refer photos below, especially 3rd photo.
I'm assuming it's diesel that's leaking not engine oil (well I'm hoping not!) given there has not been any significant drop in engine oil levels; as well based on the (excellent) topic below of gunk from EGR impacting the manifold:
The impact of the EGR system on the intake manifold of my 2012 i30 diesel.I'm wondering what investigative steps to undertake ... basically do I get my mechanic to embark on hours of removing the manifold for an inspection and clean for what is potentially quite a normal occurrence (of oil weeping)? In other words is this normal? Or am I not cautious enough ie. have it investigated ASAP given it could be a turbo related issue? (the turbo does seem to be working fine).
In terms of performance symptoms, when the throttle is floored, and the gear changing down, I do notice from the rear vision mirror quite a bit of black smoke from the tailpipe for a few secs - again, I can't recall if this is no greater than when we had the car 7 years ago when it was only 24,000kms. I just noticed it more in the past 2 years, and am wondering even if the end result of the manifold clean does not reveal any major issues, the cleaned manifold might result in better airflow under full throttle (I read somewhere the black smoke under full throttle is often an overly rich fuel mixture, which I'm guessing can also be exacerbated by lack of air).
Anyway I'm after suggestions, especially from the gurus of the EGR topic above
@Fireescape @nzenigma