Motor change under warranty

[P_G]

I am no expert in the fine details but the blow back will be dependent on a wide number of factors as well as the amount of any deposits. Here in Spain we have some of the worst fuel I have seen, it will surely provoke more deposits.

You are probably right Mike on the fuel front.

[ArthurPE]

let me be sure I understand
Audi said
oil consumption in a specific cylinder
no excessive deposits (via borescope)
correct?

you are drawing the conclusion that deposits scored the cylinder and that is what increase deposits?
correct




[quote="MikeD"]Hi ya ArthurPE.
The info from Audi was " We are not changing the unit due to lack of power or high oil temps but due to Oil consumption in cylinder 8â€

[ArthurPE]

I challenge the assertions, not the person
look it as a technical discussion,
what good is it when only 1 side is presented?

oh my god Arthur, why are you so interested in this, and challenge everyone, it's pathetic.

To the OP, that's an interesting story. I'm going through the same thing. "Wrong Oil" is Audi's claim (but it's always had the correct oil).

Here are my bore (my thought, and another mechanic, is the scratches were caused by carbon).

[ArthurPE]

lol. I've read more than I care to

I'm forwarding this post to Audi to get their take on matters
don't take it as an attack or personal
but rather a quest for knowledge and answers

honestly it sounds like yours is something specific, not deposits, since it seems like only 1 cylinder was affected and they said deposits weren't abnormal...

as far as blow-by...imho it is not a factor in deposit formation
-the seperation system is very effective
-members have actually vented the system to atm after cleaning the valves and the deposits were back in short order, a few k miles...
-I've also seem the contents of a catch can placed before the cyclone seperator...
had only water, and a very small amout of oil after a few k miles...
consider:
the cyclone after the can would have caught some of it
the oil was vapor and the small stuff (low mass) that made it thru the cyclone would have most likely made it into the engine and burned, rather than captured on the valve

my 2 cents
a bit from EGR, but not much, but this would bake the oil already on the valves and blow it up the runners
mostly valve guide seepage, in a port injected engine this is washed off

consider:
'bad' oil, for whatever reason, quality, weight, age, contamination, etc.
would wear the guides faster, increasing depoists...

and poor fuel quality WILL contaminate the oil faster...hmmmm
and wear the rings faster, another cause, and in practice the most likely cause, of increased oil consumption

OP = original poster

ArthurPE : If you would like more info about this possible problem please try this search on the internet "4.2 fsi valve deposits"

2manytoys : sorry to ask but what is OP

[Bigsidavies]

It seems that no-one can have a 'normal' discussion on any engine-related topic without arthur jumping in with both feet and turning it into something that is not interesting or informative, just annoying.

I only have the lowly S4 but keep looking and toying with getting an RS so read all these entries for info for the future. This used to be a forum that had interesting topics with some light-hearted humour, a little sarcasm and wit and a tangible level of camaraderie. It now seems full of anghst, hatred and sniping.

Bring back the good old days pre Arthur PE

Change the record fella you are one dullard !!!!!!!

[ArthurPE]

if you don't like the program, change the channel...
'dullard'? now that we have heard from the peanut gallery...
let's get back on topic
all my posts were/are, yours was not, just another personal attack...
by a clown with nothing to contribute...

if you are saying that the question shouldn't be asked (btw he never answered):
Audi said oil
he concluded deposits, Audi did not say deposits...HE did
big difference...huge
again, the link has been forwarded to Audi
I want to here their side
not 'one' side

btw: I was here before you, and I can't remember you contributing a single thing...ever
this being the first, and it being a personal attack
nice...

It seems that no-one can have a 'normal' discussion on any engine-related topic without arthur jumping in with both feet and turning it into something that is not interesting or informative, just annoying.

I only have the lowly S4 but keep looking and toying with getting an RS so read all these entries for info for the future. This used to be a forum that had interesting topics with some light-hearted humour, a little sarcasm and wit and a tangible level of camaraderie. It now seems full of anghst, hatred and sniping.

Bring back the good old days pre Arthur PE

Change the record fella you are one dullard !!!!!!!

[MikeD]

Sorry but the day job is first!
Ok to repeat, as the inlet was NEVER opened so the deposits are an unknown and will remain that way until the lump gets back to Audi for a post mortem.
Oil was ALWAYS supplied and changed by Audi, so if the oil, weight or quality was wrong then its down to them.
The car has NEVER used oil and never had any smoke let alone oil smoke.
I would love to hear from Audi as well in writing, that way we can all have a point of reference, again I love the marquee and will stay with them, but there are times when we have to hold our hands up and accept that we may have got something wrong. What makes the difference is what you do after you admit there may be a problem, that’s what separates the real deal from the also ran!
If you contest that carbon build up is not an issue, please explain the “Italian tuneâ€

[PetrolDave]

[quote="MikeD"]If you contest that carbon build up is not an issue, please explain the “Italian tuneâ€

[Sims]

I've heard of some GDI/FSI cleaner chemicals that you can squirt into the inlet manifold.

Do they work?

[P_G]

[quote="PetrolDave"][quote="MikeD"]If you contest that carbon build up is not an issue, please explain the “Italian tuneâ€

[MikeD]

I have heard it mentioned as a way to remove the carbon deposits in a motor. From what I have heard it involves high revs, long time, 0Km =high heat, not what I want for my motor.
Would love to have the details of what it is, may be someone from Audi can chime in on this.

[Sims]

I have heard it mentioned as a way to remove the carbon deposits in a motor. Would love to have the details of what it is, may be someone from Audi can chime in on this.

That would be good, a bit of opera and your carbon's gone.

[P_G]

I have heard it mentioned as a way to remove the carbon deposits in a motor. From what I have heard it involves high revs, long time, 0Km =high heat, not what I want for my motor.
Would love to have the details of what it is, may be someone from Audi can chime in on this.

So effectively the car standing still in neutral and revving it to the limiter for a period of time?

[Sims]

I have heard it mentioned as a way to remove the carbon deposits in a motor. From what I have heard it involves high revs, long time, 0Km =high heat, not what I want for my motor.
Would love to have the details of what it is, may be someone from Audi can chime in on this.

So effectively the car standing still in neutral and revving it to the limiter for a period of time?

Keep taking it in for a dyno run - same effect surely?

P_G, you car has been in for Dynos a few times, has it not?

[P_G]

It has but that is in gear acceleration so perhaps not the same. When it doesn hit the limiter you do normally see a puff of smoke and IIRC I have seen the same on some YouTube vids of RS4's on dynos.

I do try to use the full rev range on a regular basis to give all parts full range of movement / usage, especially after a long run on the motorway. Loads of air through it on a motorway, full rev range afterward. It perhaps shouldn't be necessary but mechanical sympathy goes a long way.

I don't wrag mine over 3.5k rpm until engine oil temp is up to 97 degrees and usually allow the car to sit after initial turnover first thing on a morning for a few minutes before driving off otherwise it can feel lumpy almost to point of misfiring / too rich on the choke.