depends mate...

how hard has it been driven?

how many cold starts etc?

have seen cossies do 125k without a rebuild.

it also depends alot on how you will drive it?

any problems with oil burning etc will only really be shown up if you drive the car relitivley hard.

if you just cruise around using no boost the engine will last forever.

my car had only done 67k when i bought it but as soon as i chiped it and turned boost up ot was evident that it needed a rebuild.

some engines are better than others as all cossie yb unit were hand built.

some engine builders were better than others.