Great stuff! once the initial noise died down it sounded just like my M54, which is not a great surprise really. I suspect that it was noisy first off simply because it was not well lubricated after all that time. It's going to take quite a while for the oil to warm up and find its way to all the parts. Before I attempt to restart my engine I'm going to whip the rocker cover off and douse the top end and chains with oil.
An engine always runs a little rough even if the battery's been off for half an hour but not like that and not for more than a minute as it's still got a factory map. the learning bit comes in over a longer period of driving dependant on your style and fuel etc and they are pretty minor at that.
The other thing is the water needs time to find its way round (or rather the air in the water). whenever I change the coolant in a car it sounds rubbish until it's been thoroughly burped.
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