Read lots of posts of people using Amsoil synthetic, just wonderin if anyone has used the Rotella T synthetic.Saw it at Walmart for 20 bucks a gallon.I use Rotella T and am wonderin if the synthetic is worth the cost.Comments appreciated.Read about it at <A target="_blank" HREF=http://www.rotella.com>http://www.rotella.com</A> but manufactures are only trying to sell there product.