not true shell t1 has a min of 1400 ppm of zinc the shell rotella t4 t5 t6 . is reduced zinc for the newer low emission engines .that's what I was told by a shell rep 2 days ago .
Exactly, Shell Rotella walmart stuff that was great for years has reduced Zinc levels and isn't a good option
Shell Rotella T1 is only available in straight weights, sadly
