"Neither engine is smoky" That simply means that all the oil and coolant has leaked out and it's due to seize solid or explode in a shower of gears, pistons and conrods.
A non smokey Chieftain? I've seen more hens teeth.
Been advertised several times and never sold so still a bit strong at 9K more like 7 - 8 K .
No armoured vehicle ever feels better or is nicer to drive when you drive one again after a long absence ..... it will still be hot or cold but neither at the correct time, all those little sticky outy bits that you used to slip by with the greatest of ease will now dig into your head / arm / back or whatever every time you get in or out of the thing and when it breaks as it surely will you will now have to pay for it . As a guide current price for new Sherman track is around 20K for a set of Staman tracks Sherman tank...this one is the fastest of Europe!! 2009 - YouTube