Looking for input from you guys. I've got a '00 Toyota 4runner with the 3.4l v6 with 160k. Its been fortunate enough to be garaged through all winters but this year I will likely have to park outside overnight so I'm wondering if its worth switching to a lighter weight oil. I currently use m1 10w30 year round with 7k oci. I have a healthy supply of 10w30 and 5w30. I try to get a change in right before it gets really cold and will ride that out until the spring. I'm concerned about morning start-ups since it will be outside I know it will be tougher to start. I don't have a block heater. Should I go to a 5w30 or a 0w30? is it needed? thanks for any advice!