if it h as 150,000km on it... it is possible that the owner never had an alignment done... it's not uncommon for the car to go out of alignment
also what mat be likely... is that the tires weren't rotated properly... and never checked for proper air pressure... this would end up with funny tire wear too
my advice is to have it checked out by a qualified mechanic that you trust anyway before buying ANY used car
if you live in the Westend GTA I know of a very good mechanic I could send you to with the car