Quaker State is probably one of the worst oils that you can use in any
vehicles because it is made from Pennsylvania oil stock which contains parafin
(wax) and can cause sludging inside the motor.
Also if you are going to sit your camper van outside I would recommend
covering it up with one of my high quality Westfalia Vanagon covers.  It would
keep the sun from damaging the vehicle while protecting it from snow and ice
as well.
I sell these for $200, they come with a lifetime warranty and I can send them
via the US postal service so shipping is pretty cheap to Canada ($12).
Draining the oil after the winter is a must since acids will form in the motor
from combustion by-products and condensation water combining.
Have a great winter!
Ken Wilford
Van-Again
John 3:16
http://members.aol.com/kenwilfy