Use a High Mileage oil in the exact weight the manufacture of your vehicle recommends.
none
It varies from car to car. Consult your drivers manual.
200-100000
Your question can not be answered as asked. There is not information available online for mile, mile. For a car to be considered a classic car, it has to be at least 25 years old.
I recommend a high mileage oil such as Pennzoil High Mileage in the weight the manufacture of the vehicle recommends.
I have an 02 with 90k, it still runs well. The life of the car depends on the owner. If it's well maintained then it should be fine. Good luck
100000
You can watch a 500 mile car race in Indiana.
Which ever one meets your needs. Which ever one you want - or can get for yourself.
if it is a "valuable" car then about $1.00 a mile to haul it. If it is average car, then probably about 10 cents a mile on a car hauler
Depends on the car.
.42-.68 a mile