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Sudden increase in oil usage

zcacogp

New member
Chaps,

An odd one here.

My S2 did around 900 miles around France a month or so ago. And in so doing, it used perhaps 200ml of oil. Less than a coke can full, for sure. It's always used a bit, so I wasn't unhappy. (I think it leaks a little from somewhere.)

On Wednesday I topped the oil up to the top (first time since France) and drove it from London to Southampton. A little less than 100 miles. OK, I didn't hang around on the M3 late at night, but by the time I arrived it seemed to have used 2/3 of a sump-full of oil. That's about 600ml. I didn't have a chance to investigate - it was literally just a quick check of the oil level (6 hours after turning off, so plenty of time for it to settle.)

So, 200ml in 900 miles suddenly increased to 600ml in 80 miles.

There is uncertainty in my mind about the measuring (the car wasn't totally level when I topped it up) but I'm not sure that this will explain much more than a couple of hundred ml.

So, my question is what could cause this sudden increase in oil use? Can hard use of the engine cause a huge increase in use? It has no signs of an engine that burns oil (doesn't smell, no appearance of burning blue), so I assume it's a leak of some kind.

When I get back to the car (Monday evening), what should I be looking out for? I plan to top it up, drive back to London (probably quite quickly again) and see how much it uses in that journey.


Oli.
 
Drop the oil,start from scratch,something nice and thick like Millers 10/60 nanotechnology and measure it on flat ground?
I reckon it's something to do with measurement?
 
Owner error here Oli (in my opinion).

I suspect, with time & care, that the measuring this far may prove to have been inaccurate. Even turbos don't use THAT much oil. [;)]
 

ORIGINAL: simkin911

Owner error here Oli (in my opinion).

I suspect, with time & care, that the measuring this far may prove to have been inaccurate. Even turbos don't use THAT much oil. [;)]

Yeah, check the nut holding the steering wheel, Oli
 
I managed that affect years ago by leaving the oil filler cap off... There was pretty obvious "evidence" of that all around the engine bay though!
 
Chaps,

Lots of helpful answers - thanks.

Where is the breather that may be blocked? And how hard is it to unblock it?

I'll be sure to check the nut behind the steering wheel in for an assessment as soon as possible. If it turns out to be at all short of the usual standard (i.e. perfection in every respect) then I'll be sure to report back on this thread pronto.*


Oli.

* Steve, Gerry, I think the measurement method will account for some of the discrepancy but not all of it. Good point though, thank you. [:)]
 
Update: a run back home from Southampton at a similar pace has used a lot less oil. Not quite none, but a lot less. This still doesn't prove that the person doing the oil-measuring is wrong, but ....

What is the breather that could be blocked, and how easy is it to unblock?


Oli.
 
'Nother update on this conundrum. Checked the dipstick on Thursday evening - it was at the 'full' mark.

Drove it from London -> Cambridge -> Derbyshire -> London; about 350 miles all in. All with the wife in the passenger seat so >ahem< not too quickly. Checked the dipstick again just now, and it's down by about a quarter. I know the dipstick isn't linear so would guess this is about 250ml, perhaps 300ml of oil, which means there isn't much of a clear usage pattern.

If it was a blocked (or semi-blocked) breather, which breather should I be looking at?

All help welcomed, thanks chaps.


Oli.
 
The breather is a part of the plastic oil filler assembly, a pipe comes off the top of the canister and runs into the inlet manifold (IIRC).
 
James, thanks, I'll do some investigating.

Jim - no, no sign of any cross-contamination. I'm confident it's not a head gasket (or AOS) issue.


Oli.
 

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