Lupo sdi

I've already three times at my wife's lupo sdi
The timing belt is changed with all rollers and WAP.
The last time was three years ago.
Each time the strap and all the reels were top.
Now I had to see today that they are again the
90000 km full has 360000 km.
I had thought about the straps as well
120000 km could last if you checked in regularly.
Because I don't have time right now.
The parts dealer said three years ago what about life-long durability of the belt was just not clear whose life he meant to be, mine, my wife's?
Well, when he's cracking, the life of the engine is definitely over.
Is there anyone here who has experience?
The belt looks so fresh that I even
the white manufacturer imprint can read.
There's no fraying.

So long