Vince,

If you can DIY, go buy a honda maintenance guide from pep boys or where they sell them and follow that. Also, you can buy the Honda Certified Mechanics book from Honda for around $100, it has all the ins and outs of your sister's car. If not, you can buy 30,000 mile engines from japan for fairly cheap (like around $600). I have no idea how you can get one in your area, but it is something to look into, Good Luck.

Andrew