Yes quite correct - my oversight - my apologies for the confusion [wink11]
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My advice- go to consumer affairs and your lawyer. Hit up shop that did your rebuild. If you spent 20k on rebuild and it failed so soon you’d have some grounds. Don’t be deterred. They should fix it. At their cost. It would mean giving vehicle back to them but I would not let them walk away.
As said it all depends on what spec the respective oils meet.
Swapping a 0W-30 for a 5W-30 that meets the same spec should have no bearing on wear/life and generally you won't see a difference in start up viscosity/pumping pressure at any temp seen in Australia anyway.
Operating temp viscosities will be near enough identical.
One isn't thinner than the other, a better way to term it is the 0W-30 has a wider operating ambient range.
If I understand correctly - the reconditioned engine was commissioned by the previous owner and the engine failed a while after the OP (new owner) acquired the car. The current did not get the work done.
I may have misunderstood though as information has been coming out installments.
I agree, get advice but it compounds the issue. Many "warranties" are not transferable but some are and it may take a court determination to resolve.
Certainly worth checking