so ive never been a castrol guy by any means, but i bought Castrol EDGE got drunk from it and fell in love!! i can tell its super thin when i shake it or pour it, and have found proof of my notion on here. and in another deal i bought some syntech it seemed to shake/pour just as the Castrol EDGE? grade in all my vehicles is 5w20, so thats what im referencing here, will also mention that im running Mobil 1 0w20 in one and the Castrol EDGE seems thinner, can i get an educated opinion of the thickness of Castrol EDGE 5w20 to syntech 5w20? and include Mobil 1 0w20 if youd like