Oil consumption when on highway
 

Good afternoon.

On weekend I met up with sudden oil consumption problem, while I was riding nearly 200 kms ahead and back cruising on highway at 140 km/h. Car showed me a message, that possibly low level of engine oil. Had stopped car and checked on dipstick. For sure, level were on low mark. Luckily, I had extra liter of same oil. Added 0.7 liters.

While riding in city everyday (30-50 kms/day), short distances, car doesn't ask to add oil. I mean, change to change - don't need to add oil, it stays on the same level. But when I ride on highway above 2.4k rpm, it asks. It's the second time with that kind of situation on highway.

Engine sounds good, no rattle or knocking or whatever sounds. I took off engine cover from the bottom - it was almost clean. No smoke on startup or even at load, exhaust is pretty shiny as petrol engine. I guess DPF blocks everything.

I read about piston rings, but as I understand, if the problem in them it would burn all the time, not just on highway?

Guys, can you tell me probably what's happening with my car?

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