To all, thank you so far for your inputs and suggestions. I am fully aware that this might end up having to accept that I'll never get the resolution I think I deserve, and they might not actually at any fault apart from negligence during the tur
Dealership stated that the oil level when it went for the turbo diagnostic had low oil level, but within the minimum amount. They checked oil after replacing the turbo, only way I could have run oil dry is after they've given it back to me after their repair and on the way home.
I'm not stating the new turbo caused the engine failure, I'm accusing the dealership of not investigating the reason why the original turbo failed and therefore not fully fixing the problem before returning it to me and stating it's fixed.