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How far have you traveled since the oil was changed?
Meaning how many miles have you put on the car?
Well, I was wondering because if the oil change place didn't fill the car with oil it wouldn't go very far. So the amount of time since they did the oil change isn't as important as the miles it's been. It sounds like they have filled the engine with oil, it wouldn't go that far if they didn't.
If the engine didn't leak the oil out, then it burned it out. If the oil rings have failed then it would run out the exhaust system. There are so many catalytic converters on the car that the exhaust likely wouldn't show any sign of the oil burning out. If it didn't leak it, then it used it. Synthetic oil does last longer then organic oil, but it has to stay in the engine for that to happen. It looks like the engine may have damage in the cylinders either scoring on the cylinder walls or a broken oil ring and allowed the oil to be burned during combustion. I am sorry to say it sounds like the case to me. I don't think there is any way the car would have gone 5500km with no oil in it at all. You see what can happen when there isn't any oil.
I know this likely isn't what you wanted to hear, but it's really the truth sorry to say.
Please let me know if there is anything else I can do to help.Also, please remember to rate my answer.Thanks so much!
I see no other answer, however I would suggest trying to get a used engine instead of paying for a completely new one. This would save you a bundle to be honest and many salvage yards do put warranties on their used engines. Your mechanic might even have a favorite yard he uses for such things.
They will always try to go with brand new first because there is a better mark up on the engine. More money in their pocket, that's just business. I am not suggesting he is trying to take advantage, just doing what he can to make money as well.
I would consider contacting the dealer that sold you the car of course. Since it was a dealer and not a individual you may have some recourse with them for sure. If it was an actual Subaru dealer, then you may even be able to contact Subaru customer service in your country and get some support from them as well. Here in the US I have done a lot of warranty work on vehicles that were out of warranty because Subaru was contacted and they are very customer oriented.
I can't promise anything as I am not a representative of Subaru, so really that would be their choice and decision to make.
As for any other recourse, you would have to consult an attorney and not a mechanic.
Do you have any more questions for me today?