A local chain in my area (Strauss Auto) has GTX on sale for 2.29 a qt.(this is a dollar off regular price). They have Syntec Blend on sale for 2.49 a qt.(this is 2 dollars off regular price). I wouldn't pay 2 dollars a qt. more for the blend but for 20 cents I think it's a no-brainer. Is there much difference between GTX and Syntec Blend in say 5w20?