Question about Audi A3

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Hi iv got an audi s3 and occasionally in traffic it burns oil

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For all vw group cars, this is normal,the block breather,which feeds into the inlet manifold on deceleration(the sump is possitive pressure),the valves and guides, and because the bores are plasma coated,the pistons ,oil is used to lubricate and cool these items when heat is localised.(engine hot spots).VW say in the service manual that 1litre per 500km is acceptable.although you should not get this with highway motoring.it is normal for town driving(stop/start.)

Posted on Sep 03, 2010

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hi tina
it might be a few things unfortunatly, 77k is not much for these cars but allot can go wrong with them, i can start with, valve guid seals these tend to wear arround 100,000 but deppends on use, wether hard driving or town, so you could be getting close to these, you can also check visually if there is another leak from the valve cover on the rear side or this might just be ressidue from the previouse leak, sometimes the smell of unburnt fuel can fill the car if the wind is blowing in opposite direction when standing still can fill the cab with fumes dont worry only minor, it possibly is the cold air rather than smoke condensation from the exhaust is warm and hitting cold air will do that, it dosent realy sound drastic and just keep an eye on the fluid levels as you are doing but i dont think there is much to be concerned about....hope this helps

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hi kieran,
ur problem is very easy to solve, but its an expensive fix..........($$$)

i dont know how much u know about cars, but every car with en engine(other than the Wankel) which has pistons......the pistons run in the cylinders of the engine block......at the top of the engine is where all the work is done, at the bottom part(just below the pistons), there is a lot of oil to lubricate all of the fast moving engine parts.....when a car burs oil what usually happens is that the oil goes up from the crank case, squesses between the piston and the cylinder walls and gets burned with the gas......and vise versa, at the power stroke the exhaust gasses enter the crankcase and slowly burn the oil that way.......so oil burns every 2 of the 4 strokes......there is 4 strokes in one rpm......idling is about 1500 rpm for ur audi....u do the math.......and the oil slowly burns........when the car heats up the oil burns even faster bacuse the temperature of the oil is already high.......
the pistons are equipped with piston rings to prevent oil from getting into the combustion chamber and exhaust gasses getting into the crankcase.......and the tolerance between the pston and the cylinder is also very important for the car not to burn oil......
tehre are a few ways to fix it.........the best and the most expensive would be to: bore out the cylinders, get new pistons (v6...) and get new rings, and u also might need to get the block and heads faced off(if there is any warpage....the heads are aluminum...).......
this process is called and engine rebuild and could cost u well over $2000 depending on what kind of quality u are looking for.......(its not worth it.....especially for this car, they are very cheap)...

the cheapest way to fix the problem about 75% would be just to get new piston rings.......but as soon as u take those heads off....shaving them is a must if they are warped.........and while u still have them off u might need to do the valves, which could also help the problem......and while u have the pistons out, might as well change them too...right???? so its spendy......

u might also have another problem,......a faulty gasket or o-ring, and the oil might be leaking from that faulty spot right on the exhaust, and might burn the oil that way...........that would defently explain the smell getting into the car.....if this is what is wrong, then the fix could be very easy, fast, and cheap...

if ur burning too much oil, it could be both of the problems at the same time.........plus a few more on top of that......

i hope this helps.........
....now if someone could only help me.......

i know u have posted this a while back, and probably have the problem fixed by now, but if this could help anyone else, then its not a usless waste of time......

a-vtec

sanya


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