Well what kind of a transmission is it bolted up to? different transmissions hold different amounts of transmission fluid and a 6.5 liter diesel will bolt up to several different transmissions.
It all depends on what kind of car you have.
The automatic transmission used in the 1995 Ford Explorer is a ( 4R55E )
2.5 liter 4 cylinder , or the 3.0 liter or 4.0 liter V6
Depending on which model of Ford Escort , either the 2.0 liter SOHC or the 2.0 liter DOHC Zetec engine
You could have the 2.9 liter , the 3.0 liter " Vulcan " or the 4.0 liter V6 engine . They are all over head valve / pushrod designs in a 1992 Ford Ranger
For the 4.0 liter V6 ( 5W-30 ) and for the 4.6 liter V8 ( 5W-20 ) in a 2003 Ford Explorer , according to the Owner Guide
5W-30
According to the 2010 Ford Escape owners manual : For the 2.5 liter four cylinder engine and the 3.0 liter V6 engine : ( 5W-20 )
For the 4.0 liter V6 engine ( 5W-30 ) For the 4.6 liter V8 engine ( 5W-20 ) According to the 2004 Ford Explorer Owner Guide
( 5W-20 ) according to the owners manual for the 2002 Ford Escape for the 2.0 liter four cylinder engine and the 3.0 liter V6 engine
It could be a 302 ( 5.0 liter ) or a 351 ( 5.8 liter )