[DON]

Engine manufacturer recommends regular oil changes with a 15W-40 diesel engine oil (e.g. Delo 400 or Delvac). That is all that is needed. Truckers get up to 1 million miles just doing that. Any name brand filter will do.

Allison recommends Transynd or equivalent TES-295 oils. It allows you to extend transmission oil changes to four years.

[Archived]

Allison Approved TES295 On Highway Fluids
Allison recommends that customers use an Allison Approved TES 295®
automatic transmission fluid to extend drain intervals and enhance
transmission performance and durability in all operating environments with
on-highway products.
Castrol TranSynd™
BP Autran Syn 295™
BASF Emgard 2805™
International Fleetrite Synthetic ATF™
Mobil Delvac Synthetic ATF™ / Mobil Delvac 1 ATF™
John Deer HD Synthetic Transmission Fluid
Mack Synthetic ATF™
Shell Spirax S6 ATF A295™
CNH HD Synthetic ATF™
Phillips 66 Triton 295 ATF
Kendall SHP 295 ATF
Total Fluidmatic Syn T295
Renault Starmatic A-Max

[DON]

For approved Detroit engine oils look on the label for specification: DFS 93K215(API CH-4), DFS 93K214(API CI-4PLUS), DFS 93K218(API CJ-4), or DFS 93K222(API CK-4) for your 2001 series 60.

The one Amsoil product that I know is approved is DEO 5w40.

[Archived]

Here is a link to all the Detroit approved Lubricants, Fuels, and Coolants: LINK

[Dick]

Thank you all for your help