so you've found oil in your intake pipe? the length of piping that attaches to your throttle body?...and you think it's coming from that skinnier hose that goes into your intake piping..is that right? or have i missed something?...i think the vacuum hose your talking about is the breather hose...it's job is simple, when filling up with oil the oil runs past your valve train and straight down into the sump..breather hose is simply there to allow the oil to drop to the sump quicker without going glug glug glug.
what can happen is that where you got it serviced from, they could have filled your engine up with oil too quickly and its gone through that breather hose and into the intake, hence why you've found oil in the intake piping...or what will happen, over time oil will splash up into the breather hose and eventually make its way into the intake piping.
when i first got my car, about 5 months ago, it had oil in the intake piping, that was 72,000 kms worth...its not heaps, it was just slowly leaking into the intake piping, get a rag and wipe it down, i used carby/throttle body cleaner on a rag/paper towel to wipe it up...just make sure wherever you've used the cleaner, to flush it with water, these cleaners can bugger up the plastic.
long story short, if its coming from that little hose and it's only a little bit of oil, it's nothing to worry about...just clean it up and clean up your throttle body...as for having sludge in your engine, ricey is right about the engine flush..but if i was you..after running engine flush in your oil and you drop the oil and swap the filter, i'd be getting that sump off anyway to clean it right up, kerosene or prepsol (if you can't find it just go to repco and get the K&H wax and grease remover)...other then that, do exactly what ricey said regardin the engine oil flush, every 5000, if it knocks, shut it down.
hope this helped ya, cheers mate
