1983-1992, no turbo.
1992-1998, a turbo.
1999, finally figured out the intercooler thing that Dodge got 7 years earlier.

The International 7.3 was better than the Ford/International 7.3 only because Ford changed a few parts, such as the injectors, water pump and a few other items. The bean counters at Ford blew it. The injectors were the biggest problem with the 7.3 (along with CPS)
FI was right about the 6duh0......NOT a good engine at all. LOTS of problems (although you will find a few that are happy with them). I haven't heard much about the 6.4 other than it's a PITA to work on .

Meanwhile, I'll keep my 99 7.3

Oh, if you want an additive, put in some Bio-Diesel. Same cost as #2, but much better lubrication, even in amounts as low as 5% (B5).

__________________
87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100

They average 12-14mpg.

lol, minds well be lol.

__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

There was some report on what additives did a good job of adding lubricity to the ULSD. Biodiesel was highly rated. I forget which comercial additive was the best. I think it was Optimax 2 cycle oil. I have put in some two-cycle oil. I think the reasoning between it and regular motor oil, is that it is designed to burn in combustion. So it leaves less deposits.
Tom