TPC
Wrenching Dad
- Joined
- Sep 20, 2007
- Messages
- 30,539
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Our 2001 Allison GMC 2500 I change the fluid and spin on filter every 25.000 miles.
The owners manual doesn't list interval nor fluid type so I went with Dextron 3 and a new filter saving and reusing the magnet.
Our 2015 GMC 3500 Allison owners manual states Dextron 6 at 97.000 mile intervals.
I hear it's ok to use the SYN 295 fluids. The tale goes it's better but more money than the Dextrons. Longer between intervals and evidently lubes a bit better when dirty.
Any takes?
The owners manual doesn't list interval nor fluid type so I went with Dextron 3 and a new filter saving and reusing the magnet.
Our 2015 GMC 3500 Allison owners manual states Dextron 6 at 97.000 mile intervals.
I hear it's ok to use the SYN 295 fluids. The tale goes it's better but more money than the Dextrons. Longer between intervals and evidently lubes a bit better when dirty.
Any takes?