Long story short: just been to see a favourably priced '99 Astra 1.6 Sport (16V Ecotech engine). The lad said the cambelt tensioners went 'about 10,000' miles ago so he had the head rebuilt and new headgasket. He's not used the car in a few months and it hasn't been used he tells me. Anyhow went to see it today, he fired it up and it sounds and drives well enough BUT...it's smoking a bit when revved hard and also when first started. Very slight 'mayo' signs on the bottom of the filler cap, being fair I expect this could be condensation after it stood a while. The smoking got me thinking though, he says once warmed up it's fine as he'd left a couple of months before and it did it until a good couple of hours welting it cleared the smoke. Although he'd done an oil and filter when he rebuilt the head I wondered if fresh fuel, oil/filer change and some Redex injection treatment (or similar) would help or whether I should be worried about the smoke?
Water looks slightly dirty but not enough to worry me by the way and the oil didn't look like it showed any hadgasket failure signs after a test drive. He'd let the car warm up on his drive before I get there and I went about 2 miles in without thrashing it too hard and it reached mid-temp and the fan cut in so don't see a problem on that score.
Any thoughts greatly appreciated because while the price is right I don't really want to be lobbing loads of money at it once I've bought it. It's got a few months test still left to run by the way.
Thanks in advance, hope the above made sense.