Your engine has much more left in it. They usually last past 200,000 miles and into the 300s
maintenence is tough because of the price, but just take care of it.
oil changes arnt too expensice i dont think.
you may need a type 2 tuneup soon, if it hasnt already been done. They are usually about 400 bucks, but if they find something wrong, and need to replace something, then of course you will need to pay for that....
i am not sure of any common problems for 325 '99, but i am sure it will be fine for now.