BlueWaffle
New member
Ok I'm fixing to switch over to a synthetic oil in my 6.0. It's running like arse when cold so I want to go to a lighter weight (5w40). I'm trying to decide what brand to go with and there isn't really much discussion about oil's on there. So, thoughts, experiences, Valvoline Extreme Blue, Shaeffers, Rotella, etc, etc. GO!!