Originally Posted by montecarlo84
at 100% ATF there is a power loss,but if I'm not towing anything I don't notice it.
From my own guesstamating 80% is a good all around blend
(note)depending on your type (year)of truck will depend on how much you can run.
I have a 96 chevy 6.5 TD,It dose not have an optical senser.
6.5's didn't have any power to begin with. At lest my 95 didn't, it was a real turd. so I got a 04 2 ton Duramax.