hello i am thinking of buying a sami i found and was wondering about how many mile the 1.3 motor last thanks

Forgive me - but - typically, how long is a piece of string?

ok well let me rephrase the question. about how many miles are you guys getting out of your 1.3 motors before a rebuild is necessary. 

i ask because the sami i am looking at tomorrow has almost 150k on the original motor

your best bet would be to grab a 20 dollar compression tester from harbor and freight (the screw in type) and plug it in.  takes a few minutes and you should expect to see 165-190 PSI per cylinder.  otherwise check for smoking and condition of engine oil.

if it truly does have 150K thats pretty low for an old vehicle. 

My 1.3 (which I've had from new) has just over 120k miles (on the original motor) which has been meticulously maintained, oil & filter every 3000 miles, and everything else "by the book".

It's using oil & the compression on all four holes varies between 90~120 dry & 180~200 wet (so I know I have worn rings/bores), it runs surprisingly well given the low compression (FSM says it should be between 150~200).

Should this be considered typical?

I've heard of folk getting 200k and in some cases over 300k on these motors - but a lot is going to depend on the way the vehicle was used and the way it was maintained - if it was used to do a daily 20 mile commute with mostly highway usage, 150k is nothing - if like my car, it was used for mainly stop-start short trips (20~40 miles a day, no single trip over 2~3 miles) and all in a small city, then you'll be lucky to get 150k.

And of course - if it was not properly maintained ...

Like jaunty says - a compression test will tell you what you need to know.