10 minutes ago, Evolution13 said:

Lemon of an engine.

Absolutely!

In regards to the potential piston ring issue. We can only advise. Though, have you removed the injectors and used a borescope to inspect the cylinder walls? If you have any scoring then it would look like a ring issue. This would give you a better indication of whats going on, and if they are scored, then youll not be wondering anymore. But then this may also be delaying the inevitable of starting the dreaded job.

After reading and researching about the problem the past month or so, some seem to have gotten away with removing the pistons, cleaning and fitting new rings. But this would depend on a number of things, such as piston/cylinder wall condition etc.

When i was worrying about it, I thought about buying a second hand CUPA/CUNA block, having that machined 0.5mm oversize to match the new pistons, then swap everything over. Saves having the car out of action for longer, waiting for your original block to be machined. You could then get your original block machined with new pistons and sell it on, try to recoup some of the money spent to sort the issue.

Thank you verry much for advices!

Today i will start process and lets see how it goes ;)

@Linso Were you able to successfully progress?

Hi,

Yeah so in final i changed piston rings ,honed block , timing belt + gearbox clutch

after 1k km i changed oil + filter , now per 7k km i have added 0.5l 5w30 Oil

Oh!

Gawd!

Skodas used not to be like this

Looks like VAG are trying to be more like Fiat than Fiat themselves

I'm still driving around in a 2002 Octavia ( think thats 17 years now ) 'n it just works

I have similar issue but i have done fair bit of mileage, mine is a 66 plate 2.0 TDI and clocked 180k. Lately its been consuming too much oil, i do about 20 to 25k miles a year, but this is my 3rd oil top up of about 500ml within this year. I never used to do it then i did once a year then two and this time its three. i might have done 4 to 5k miles between the topups.

looking at forum it looks like its not abnormal.

Measured mine recently.

Im burning 1 litre of oil to every 650 miles.

Its also regenning more often than not, which takes me back to my original post. Is the mid range oil which is mainly used on services good enough for the Cupa/Cuna engine?

The oil is getting too hot, too often, due to the regens, and the oil is breaking down faster and making its way past the rings. Makes me wonder if thats why some swear by Ravenol/Liquid Moly with Ceratec. As they may have better heat resistance.

Obviously doesn't take away the fact the piston rings were never good to start with. But can it be slowed down by better quality oils, and a DPF/EGR delete?