Dont here very much about Castrol GTX Dino here but after reading some of their add packs the tri-shield seems very good for addition.I remember doing a oil change dumping out Castrol and how CLEAN it was after 6 months aprox. 5,0000 miles. I used 5w20 by the way. Not too much moly and boron but this Tri-Shield is doing something good i guess.Maybe the Tri-Shield is cleaning better????