Where is the DEF tank on a 2008 International

there isnt one. def didnt come along until 2010

 

Its next to the blinker fluid fill.

 

the same place it always been nobody moved it

 

One does not really need to know where the tank is, just the filler cap.

If there isn't one, why worry about it?

 

Actually, the 2010 Prostar I had for awhile did not have DEF either.
It did have a catalytic converter type thing that would start cooking and kick out white smoke every so often.

 

I believe Navistar tried to avoid using DEF with the Maxxforce by jacking up the EGR duty cycle. I think we all know how that turned out.

 

Not too good......my favorite quote from that debacle.......

including testimony about the engine program by former executive Jim Hebe that the company "did not test ####".

Navistar Hit With $30.8 Million Judgment in ProStar/MaxxForce Lawsuit - Equipment - Trucking Info

 

Actually, I believe it was 2011.