Looking for experienced drivers, GTO fluids suggestions. 65 rebuilt 389 (10-1 compression), Tri-Power, rebuilt manual trany, 10 bolt posi rear / 3:73 ratio. Completed break in and now 2k miles on second motor fluid (Delo 400 15/40 Diesel fluid, ZDP additive) Time for the third motor oil change and looking for transmission and rear end suggestions. Did I shock anyone with the diesel motor oil? Thanks for your time.