i own an astra gsi k reg with 72000 on the clock,problem is when starting from cold i get a loud ticking noise from the top end and a lower sounding ticking from deeper down in the engine.Oil gets changed every 6000 with mobil 1,i also added slick 50 a few years ago.Seems to last for about 2 minutes then everything is fine,though it has got more prominent over the last year.Question is should i be concerned, as a local mechanic reckons its very common and should'nt be a problem if i keep below 3000 revs until i'm up to temperature.Any of you guy's got an opinion on this?..............
