So I want to share what happened.. On this past Saturday I changed my oil from full synthetic valvoline 5w30 to Castrol EDGE 10w30 and all was well until Tuesday morning when the temp dropped to around 40degF. When I started my engine I immediately heard unusually loud valve train noise and I just figured it would go away after the engine warmed up a bit.. that is not what happened at all!   On the drive to work I dropped my daughter off at school and left my engine running for the walk over t