How often should I change the oil on 1998 Boxster ?

[rick3000]

Change it once a year, if you're logging less than 10k miles. I change mine every 7500 miles, half of what Porsche recommends. Boxsters take significantly more oil than your standard car, so it can be pricey to change it too often. It depends on your driving, if you're pushing the engine a lot, 5k would definitely not be a bad idea.