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Sorry for the late update. But it was indeed a Timing Chain issue which needed to be replaced, so whole engine out.
BMW did not come to the party and said that since the last service was done by an indy and not BMW(this was done before I purchased the car) they could not guarantee which oil was used. Contacted the dealer who sold me the car and was able to get the details and they used an LL04 oil so it was spec, but BMW still refused saying that there was a missed service, I gave up chasing for goodwill as I needed the car running and it might take me a couple of weeks for a result. BMW wanted to charge me 10,000 for the job.
Started looking for Indy who can do it and found a gem recommended by my brother - Oliva Automotive 0402 556 148 (sorry shameless plug). He's just starting out and always up for a challenge. He changed the timing chain and guides with the engine out and charge 2500 for the whole thing.
Car has been running great for the last 4 months so all is well atm.
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