Hi 

 

I just bought a used Octavia 2015 1,8L petrol done 210.000km. It has a huge oil consumption at 1,5L at 1000km. The seller has bankrupt itself just after I bought the car so I am stuck with it.  

Shuld i try thicker oil like 10W-40 or will it just do more harm to the engine ? 

I would change the oil to the correct grade as a first step.

 

No guarantee that it is correct or not long overdue for a change seeing  that you just bought it.

 

 

Hi, yes they did that when i did the oil consumtion test at Skoda. Have topped up about 3 liters since i bought the car. 

Eyks - thats a high oil consumption.

 

Worth taking a look at this posting about the issues on the 1.8tsi engine:

 

 

That'a different generation of the 1.8 TSI (GENII, well known for the oil consumption) while mlimseth has the GENIII.

 

@mlimseth - The following might help with this issue:

 

1. Check the PCV valve and replace if required;

2. Before changing the oil, use and engine flush (e.g. BG EPR, Amsoil engine flush, Liqui Moly engine flush). Do this for several short interval oil changes and see if there are improvements;

3. Try to do a piston soak (you'll find a lot of information about this with a simple search).

 

Points 2 and 3 will help if you have stuck piston rings (which I suspect you do).

 

Do not use a high viscosity oil, you'll do more harm than good with a low quality 10W40.

 

 

If that is the case and solves it will be good. What about do a compression test on the cylinders will that tell something ?

If you can do the test, go for it! It should tell which of the cylinders are more affected.

Do both dry and wet compression tests - this will help to narrow down where possible problem lies.

Thanks for the input! yes i can do a compression test. 

Is the car actually burning it? If your going through 1.5litr every 1000 mile I reckon it would be smoking like a chimney. If its not bad check the engine undertray for oil. It can collect there and then drop onto road when driving. A compression test is a good idea and use the correct oil. 

Alasdair

5 minutes ago, Alasdair1 said:

Is the car actually burning it? If your going through 1.5litr every 1000 mile I reckon it would be smoking like a chimney. If its not bad check the engine undertray for oil. It can collect there and then drop onto road when driving. A compression test is a good idea and use the correct oil. 

Alasdair

At Skoda under the oil consumption test they concluded with internal use off oil. They checked for leakage and checked that the turbo was in good condition. The exhausts are not like a chimney, its lock normal. 

7 minutes ago, mlimseth said:

At Skoda under the oil consumption test they concluded with internal use off oil. They checked for leakage and checked that the turbo was in good condition. The exhausts are not like a chimney, its lock normal. 

Wonder where its going? at that level I reckon it would be smoking and exhaust would be black unless its been dumped into intercooler or pipes?

Hope you sort it. One thing is at the rate your losing it you would only have to change filter. Reckon oil is getting changed automatically

25 minutes ago, Alasdair1 said:

Wonder where its going? at that level I reckon it would be smoking and exhaust would be black unless its been dumped into intercooler or pipes?

Hope you sort it. One thing is at the rate your losing it you would only have to change filter. Reckon oil is getting changed automatically

 

I wonder if it's the oil control piston rings like in this example?

 

 

Hi 

 

1. I did a check on the PCV valve but not sure how to tell if its bad or not. Its locks clean and when i blowed into the little "funnel" it was not blocked. 

2. Then i did the compression test. Engine was up to temp dry. 

1. 12,5 ---- 2. 12.5-----3. 11.5 -----4. 12 Bar

Wet.

1.14.5 ------2.14--------3. 14.-------4. 14 Bar

But it locks like i have some sort of oil leak close to the filler cap. Its oil residue on coil 1, around filler cap and down the side off the engine. Maybe is a leak under the side plastic cover that hold the filler cap.  

The coolant is also clean, no oil. 

 

Edited 26 February, 20251 yr by mlimseth

Compression test seems pretty even. Not sure what it should be but they all are pretty near equal. Your engine seems from the photos pretty clean. As your losing/using so much I would expect a leak that is causing the problem to be pretty noticeable. I was thinking that it might be valve stems seals if not the piston rings. The plug looks pretty oily and worn. You could try a leak down test. Have seen cheap ones online.

Alasdair

The plug shows that a lot of oil is burned. Most probably the oil rings are clogged and stuck. 

6 hours ago, PaulTT said:

The plug shows that a lot of oil is burned. Most probably the oil rings are clogged and stuck. 

The next thing i will try is a piston soak, on the internett Berryman B12 lockes to be the stuff. But i have problems order it to Norway. But i find other  "Fuel Injector Cleaners". 

Engine flush will help as well (repetead few times with short OCIs). Berryman product seems to be the best choice for piston soak, but not easy to source within Europe (tried to find it with 0 success). Another great product (and easier to source) is Amsoil Power Foam (fill the cylinders directly through the spark plugs holes and leave it for 2-3 hours).

1 hour ago, PaulTT said:

Engine flush will help as well (repetead few times with short OCIs). Berryman product seems to be the best choice for piston soak, but not easy to source within Europe (tried to find it with 0 success). Another great product (and easier to source) is Amsoil Power Foam (fill the cylinders directly through the spark plugs holes and leave it for 2-3 hours).

I have seen it on Amazon if its the same stuff. 

Alasdair

39 minutes ago, Alasdair1 said:

I have seen it on Amazon if its the same stuff. 

Alasdair

Yes, but amazon dosent ship that produkt to Norway. 

Sorry didn't realise where you were. 

Alasdair

Redex was once a product recommended to free gummed-up piston rings - not sure that this is the issue here though, at least one of the issues with EA888 engines was unsuitable oil control rings - but I thought that particular issue had been addressed with the Gen. 3.    

Had a word with an old mechanic friend and he always used ATF and acetone mix 50/50. Said to drain oil first and let mix drain through pistons and out of oil drain. Do a few times then flush engine and refill with new oil. Not sure if its suitable for newer engines. He is very old school diesel mechanic. He said he always did it with engine warm.

Alasdair

1 hour ago, Warrior193 said:

Redex was once a product recommended to free gummed-up piston rings - not sure that this is the issue here though, at least one of the issues with EA888 engines was unsuitable oil control rings - but I thought that particular issue had been addressed with the Gen. 3.    

 

Indeed, this issue had been addressed with Gen3, hence signs of oil consumption appear very late (or not at all) and are rather insignificant compared to that of Gen2. However, since the low tension piston rings became a standard, you will find this problem associated with all brands, especially combined with the (crazy) long oil drain intervals recommended by the manufacturer (and followed by most of the owners). Short OCIs, high quality oil, engine flush at least once a few oil changes will keep problems away. A piston soak should solve it.

Edited 28 February, 20251 yr by PaulTT

This is not a new problem but possibly made worse with long oil changes and low friction piston rings - all makes. Back in the day I used to try squirting in copious plus gas into each bore and leaving overnight before oil change. I used to then squirt in a touch of oil into each plug hole ,  turn engine over a then a thimble of petrol into each bore before starting.  

 

This same procedure was good for waking up gummed up or long dormant engines,