What do you guys recommend. I have a 2001 Pathfinder with 48K on the vq35de engine and a 2003 tacoma with 16K on the 5vz-fe. The recommended viscocity for both is 5w-30 but both manuals say that you can use 10w-30 if temps are above freezing. I use 5w-30 synthetic oil in both. What are the advantages or disadvantages to 10w-30?