Hi is every one well?
I am a new member, posted in the wrong forum so here goes again:
I am in Sydney and have just bought a 2002 Boxster - why I didn't acquire this wonderful thing earlier I don't know!
Just one day after purchasing the car (for a very good $10K below market price from a very nice old man as as-is private sale, and already have a strong feeling for it, honestly >< so I want to fix rather than return it), I noticed an engine rattling/knocking noise.
I think this is IMPORTANT infos:
1. The noise started quiet and got louder after ~10 minutes as the car warm up.
2. After being tilted to get on a tow truck, the noise disappeared for a good hour.
3. After a quick check it's not exhaust shield nor anything outside. It's 'inside'

4. I hope the previous owner serviced the car before selling and may have used wrong type of oil viscosity...
5. Oil level is good.
6. It's winter time so before start the oil temperature is around 15 Celcius.
An engine-out diagnosis only here cost $3K so I have spend $600 with 2 mechanics and still nobody could 100% pins point the problem without engine-out.
As an unfortunate cynical person, I only have 80% trust on the everything in life including the poor Porsche mechanics/dealers

, and always want to know everything myself

. I am here seeking you guys' helps with the best of your guess, before I shed $3K for engine-out diagnosis:
1. Would these factors eliminate a timing chain problem?
2. Regardless, just for my knowledge, how much roughly in US/Australia to fix a timing chain problem?
3. Is fixing timing chain an engine out job?
4. Are lifters an engine-out job? How much for fixing lifters please?
5. What else could it be please?
Thank you very much again to everyone and hope you are well.
Kind Regards,