Just had my RD28Ti (1999 GU) completely rebuilt and have been driving it now for about 250km and am noticing a different trend with the ol' Patrol. When climbing any kind of incline in 4th gear, my EGTs skyrocket almost immediately to 400-500C post-turbo. Before the engine rebuild, I could get part-way up in 5th before the EGTs hit 400C and if I dropped into 4th, it would finish the climb in the 300-350C range. Now, I'm having to back off in 4th to get the EGTs down to a normal temp and I can't take any hills with any kind of speed at all. This is even in sub-zero weather here in Siberia.

Is there something I should be checking for, or is the engine really running that much hotter now with everything tight and full compression?