Why does my Vauxhall Astra Estate ratting during start up?

My Vauxhall Astra Estate (1.6 petrol with 200k on the clock) has developed a heavy rattle/knocking noise. It last for a second or two at the start up. Sounds like it's in the head/VVT area. Always flushed engine with oil changes, but I'm guessing either the oil is draining back completely while the engine is not running or blocked/defective VVT gear. Does either sound correct to you?

Asked on 9 October 2016 by Jon Kempson

Answered by Honest John
Could also be that the oil filter does not have a non return valve. Best only to buy OEM or known brand oil filters. But at 200k you can expect some engine wear.
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