I have a 2002 Tacoma V6 and ive been using redline 5W30 pretty much the life of the truck (50K) and just recently i swithced over to amsoil 5W30 and now i want to switch again. Whats best between the AMSOIL Series 2000 (0W30) and the Series 3000 (5W30) for extended drain intervals? Since Series 2000 thickens alittle how well does the Series 3000 hold up? Ive been changing the oil every 5K because of warrenty issues and now that the warrenty is about over i want to extend the OCI. Thanks.