I'm planning on switching over to Mobile 1 synthetic with Wix or Purelator filter this weekend, but have a couple of questions.
Here in Iowa, the winters gets pretty cold and the summer, while not extremely hot in temperature, is quite humid. What viscoscity do you guys recommend? I was thinking 0w-40.
Is it ok to switch viscoscity based on season? ie, use 'thicker' oil for the summers, and 'thinner' oils for the winter? Or should I pick one and stick with that?
Lastly, the dealership has been handling the oil changes. I got it done at 1000, and 3000 miles, and the car is just over 5000 right now. Is this too early to switch to a synthetic?
Oh...when torquing the drain bolt back on, is there a specific torque or does everyone tighten by 'feel?'