Re: Questions for people with cars
1 - Read the manual! different car makes recommend different times. They spend a large amount of time and money to give you those numbers. Read 'em :)
Car oil is the #1 thing you can do to make your car running like new. Don't cheap out on oil and filter. The xtra couple of $ will help you in the long run
If car is over 5 years old. 3 months or 3000km (whatever comes first). Change the oil regardless how good it is or what's recomended.
2 - Should do it once or twice in 2 months.
3 - Ya neat stuff. Not necessary if you dn't get too much rain :)