How long routes do you drive most often? If you've only been driving short distances recently, the oil may not have warmed up to operating temperature, especially in winter. Emulsifiers bind water and cause the deposition of discolored goo. This is the general and simplest cause. How often do you change the engine oil and what is the specification?
Milky oil
Hi guys,
I have an A5 2.0 TFSI B8 for about 3 years now, done 170k miles, 50k just on the last 3 years. Apart from topping up oil every 1k miles and I had to change once the water pump, I didn’t had any mechanical issues until now.
On 1st of December I had the service done. Oil, all filters and spark plugs.
I drive 20 minutes to work and back, mostly motorway, sometimes I push down on gas pedal.
One night, coming back from work, I felt a strong smell, like clutch smell, I don’t know if it has anything to do with the problem itself, at that time I thought it’s from outside.
At the last oil change, old oil was fine, no water in it, coolant level was between min and max and the mechanic add some more stating that if it’s too much, will go out anyway.
After 2 months now, I was just checking the alternator belt, to see if I could change it myself, and I had a look at the deep stick (I bought that deep stick when I noticed that the oil level goes down quite often), and I could see the milky oil.
The coolant level is between min and max again.
I called the mechanic and he told me it’s pretty much f..up, that the gasket it’s gone.
The mf even offered to buy the car for £800…
There is no smoke when I drive it around, not more then usual when it’s cold outside and you can see the vape on your mirrors.
I know it’s vague, but I know for sure that the car is not worth £800, especially in London now.
I have an A5 2.0 TFSI B8 for about 3 years now, done 170k miles, 50k just on the last 3 years. Apart from topping up oil every 1k miles and I had to change once the water pump, I didn’t had any mechanical issues until now.
On 1st of December I had the service done. Oil, all filters and spark plugs.
I drive 20 minutes to work and back, mostly motorway, sometimes I push down on gas pedal.
One night, coming back from work, I felt a strong smell, like clutch smell, I don’t know if it has anything to do with the problem itself, at that time I thought it’s from outside.
At the last oil change, old oil was fine, no water in it, coolant level was between min and max and the mechanic add some more stating that if it’s too much, will go out anyway.
After 2 months now, I was just checking the alternator belt, to see if I could change it myself, and I had a look at the deep stick (I bought that deep stick when I noticed that the oil level goes down quite often), and I could see the milky oil.
The coolant level is between min and max again.
I called the mechanic and he told me it’s pretty much f..up, that the gasket it’s gone.
The mf even offered to buy the car for £800…
There is no smoke when I drive it around, not more then usual when it’s cold outside and you can see the vape on your mirrors.
I know it’s vague, but I know for sure that the car is not worth £800, especially in London now.
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Ha ha, yeah you need to get the car looked at in more details, possible pressure testing etc to find the cause of the mayo. But unfortunately it does look like head gasket, probably between the coolant and oil passages. There are products that will re seal the gasket, and some have good results, but they can introduce other issues like blocked coolant passages. I've used in the past on old cars and they seem fine, but whether you want to try that approach on a nice car is up to you. Depends on your budget etc. 
Edit
It’s been almost 2 weeks since I last started the car, I had a closer look under the hood and I saw a coolant leak around the water pump. Is there a way to leak water in oil around the water pump?
Water dropped even if I didn’t use the car and also I could see a wet spot on the ground.
Water pomp has been changed around 10.000 miles ago.
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This only if the coolant galleries are leaking into the cylinders, basically burning the coolant. And usually quite an amount.
In Yulian's case, if it is coolant in the oil causing the milky oil, then that's the seam between oil and coolant, but when cold, the oil is under more pressure than the coolant so would pass into the coolant. Once warmed up the coolant pressure will be around 0.5 to 1 bar so possibly enough for coolant to pass into the oil.
Fortunately, that oil doesn't look that bad, when it's a definite leak the oil looks like brown mayo!
It does look like a leaky water pump, again! pump can only last 10k miles, even my S5 had a new water pump at 10k miles from new! Do you know what brand of pump was used in the replacement?
My S5 only likes to be just above Min when cold as when hot, it is at Max. So when at Max when cold, when it gets hot, it just squirts it out through the tank cap. I even bought a new cap as it didn't look like the coolant got to a proper pressure. The pressure keeps the coolant level down.
I would change the coolant pump if that leak is around it and change the oil, if it's older than 4k miles. and see how it goes!
It does look like a leaky water pump, again! pump can only last 10k miles, even my S5 had a new water pump at 10k miles from new! Do you know what brand of pump was used in the replacement?
My S5 only likes to be just above Min when cold as when hot, it is at Max. So when at Max when cold, when it gets hot, it just squirts it out through the tank cap. I even bought a new cap as it didn't look like the coolant got to a proper pressure. The pressure keeps the coolant level down.
I would change the coolant pump if that leak is around it and change the oil, if it's older than 4k miles. and see how it goes!
I have had mine on Max when cold, but not long after driving a few times it always seems to go down and sit at a bit above Min mark when cold. When hot it sits just below Max. At first I thought I had a coolant leak somewhere, but since I left it at just above Min when cold, it hasn't gone down anymore, so I leave it and it's been like that for well over 12 months, possibly 2 years.
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