This morning it was 9*F outside when I went to start my car. The engine was noisier than usual and really sluggish also it want to rev at about 1900rpm. I think I'm going to dump the 5w-30 Havoline thats in there and get some Mobil 0w-30AFE. Don't like the noisy thats coming from my valve train. Its gonna be cold changing it.....