I don't know much about cars besides how to drive them, but my father gave me his 2005 Chrysler Crossfire as his age and health make it difficult for him to get in and out of it. It runs like a dream and is a lot of fun. I've had it for about a year, but in that year I have only driven it about 7,000 miles. It has 115,000 total miles on it.
It requires synthetic 0W-40 oil and takes 8.5 quarts of it, which amounts to about $130 every oil change. The owner's manual says to change it every 6 months/6,000 miles if primarily driven on the freeway, which it is. So far I have changed the oil every 6 months, even though one time it only had 2,500 miles on it (didn't drive it much in the Wisconsin winter). My question is, in those low-mileage circumstances, do you really have to change the oil every 6 months even if you haven't put many miles on it?
I really like the car and want to "treat her right" (e.g., high octane gas as the owner's manual insists, etc) but don't want to do unnecessary stuff...