What type antifreeze on a navistar 466 engine?

You need to specify a year, because it does make a difference. We used Rotella 50/50 blend in our 1999 - 2001 trucks. What you really need to do is look up the nearest Navistar International dealer, give their maintenance department a call, and talk directly to them. Again, the coolant requirements can vary according to model year, and you want to be especially certain that you're using the proper coolant in a DT466, as it's a wet sleeve motor, and the use of improper coolant can have disastrous consequences.