Amsoil 5w-30 Series 3000 Oil in both '99 (348,000 miles) and '02 (152,000) Powerstrokes with dual bypass filters, '99 has over 70K miles on the oil change, by oil analysis.
Also running Amsoil in both 6 speed trannys, transfer cases, and Differentials.
Amsoil 5w-30 in the 2010 Chevy Impala (46,000 miles), with Amsoil ATF in the tranny.
Of course, I am a dealer for Amsoil, so I have it available and it is a great oil. 
__________________
Thank you and have a great day, Troy Detweiler
I have a '99 F 250 7.3L Diesel w/ a 6 speed Tranny and 4x4.
Mods: Amsoil dual bypass oil filters, Amsoil air intake mod DIY, fuel preasure spring mod(70psi), FU Chip and Burner , 3.73 rear gears, leveling kit (DIY), Stabilizer bars on the rear axle (DIY).
'02 F 350 7.3L, 6spd,4x4,CC, Dually- Just bought 4-15-11
|