Hello,I am a long time lurker and first time poster.Hopefully I will sound intelligent enough to do so.Anyway,I drive a 2007 GMC Sierra reg cab long box with a 4.8l. My daily drive is 13 miles with an average speed of about 45mph.I live in upstate NY so it can be cold at times during the winter.I am currently running Havoline DS. I have a stash of more DS,Valvoline dino and Synpower 4718M. I am currently doing 3000 mi OCI which equates to around 4 months.What would eveyone recommend?