Oil Consumption

You will get oil vapours in the separator and over time they build up along with carbon deposits and gum up. Long life oil regimes just encourage it. Once it becomes blocked pressure just builds up in the engine forcing oil out to burn. I always checked the oil level and never overfilled the 1.4 (Cobalt Blue). The oil level alarm would go off which was a huge surprise since the oil change was only a month before to find low oil level. This just went on and on and as you know i bought the FSI which thankfully has been a great car. So as they every cloud has a silver lining. :)
I agree, a good FSI is, indeed a joy.

I can see some volatile compounds (especially with poor oil quality), will go that way, and gum things up, as those same volatile compounds condense and combine with soot particles via the EGR and gum FSI inlet flaps!
The oil separator will always have oil in it, as the separation process involves the oil/vapour mixture flowing over a series of weird, with the vapour bubbles separating as they flow over each successive weir. Only after the final weir is the (bubble free) oil returned to the crankcase. If that oil is dirty (poor oil or lack of oil/filter changes) then both the gap between weirs, and the return path will get blocked, forcing oil into the inlet. I can understand that.
Just can't see how a couple of litres of brand new oil makes the leap to the top of the crankcase, and into the PCV system over 2000 miles.
Answers on postcard I guess..
Mac.
 
These AUA and BBY blocks have been known for piston slap (google it) and seized oil control rings which means a new block because these aluminium engines can't be opened up as they distort.

Minor detail. Back in 2019 we checked if the BBY engine could be rebored and it can., with the workshop manual piston and bore sizes for 2 grades of oversize pistons.
What you can't do is remove the crank as the block will distort if the main bearing caps are loosened.

Cheers Spike
 
Minor detail. Back in 2019 we checked if the BBY engine could be rebored and it can., with the workshop manual piston and bore sizes for 2 grades of oversize pistons.
What you can't do is remove the crank as the block will distort if the main bearing caps are loosened.

Cheers Spike

That's what i'm referring to as per the Audi technicals, the removal of crank renders it useless. Not sure i'd like to have an engine rebored with all the swarfe it creates in there with crank in position, i'm interested to know how they overcome that problem?
 
It may, or may not be significant, but (from the original post) this high oil consumption only occurred after an oil change service.
For 1.5 - 2.0 LTRs of oil to pushed out of the crankcase over 2000 miles, when previous to the oil change, oil consumption was (I assume) minimal, points to something associated with that service. I don't have any detailed knowledge of the 1.4, but my thoughts turn to wrong oil? overfilling/dodgy dipstick?

@triumphant59 how did you know your oil needed topping up? Dipstick or Warning Light on the dash?
Mac..
The low oil level warning light came on, low level confirmed by dipstick. Previous oil change using the same 5w30 oil was done at 10000 miles before recent change 2000 miles ago. In the 10000 miles I had topped up total of 2.5L of oil, ie remainder of 5l can plus 1l.
 
My 1.4 petrol is using .75l of oil per 1000 miles. It has covered 150k with pretty much full service history. Oil and filter were changed 2000 miles ago using Westway 5w30 synthetic oil. I can’t see a leak, Is this excessive with these miles?
Same here! Seems to be a leak at back of the engine as dripping down the wires going to the oil level sensor. I'm thinking it's from the evaporator equipment at the back or maybe even from the sump gasket. The hunt continues.
 
Quick update. Finally got around to investigating the oil separator today. Oil was running from the bottom of the separator, so I took it off to find someone had been there before me! They had applied copious amounts of gasket gue to all mating surfaces which shouldn’t be necessary, I wouldn’t have thought, I cleaned the separator by soaking internally with wd40 and then blowing out with my airline, cleaned all mating surfaces and replaced, cleaned/dried all surplus oil from the sump and took it for a run. On inspection all seems good, no leaks so fingers crossed hopefully the problem is cured!
 
Quick update. Finally got around to investigating the oil separator today. Oil was running from the bottom of the separator, so I took it off to find someone had been there before me! They had applied copious amounts of gasket gue to all mating surfaces which shouldn’t be necessary, I wouldn’t have thought, I cleaned the separator by soaking internally with wd40 and then blowing out with my airline, cleaned all mating surfaces and replaced, cleaned/dried all surplus oil from the sump and took it for a run. On inspection all seems good, no leaks so fingers crossed hopefully the problem is cured!
Hi triumphant59,

How is the oil leak going?

Did you fix it?
 
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