4-108 that does not leak!!!
Call the national perkins dealer and talk to a tech or the guy that teaches.
I will try and findthat # for you. They will also tell you who in your area
is a perkins mech.
For what it is worth I had blue and black smoke. Ran the **** out of it
changed the oil several times, once ran moto-flush thru it. No smoke now and
seems to run cooler. However you may want to have real diesel mechanic do a
compression test. New fuel may make a difference too.
- Allen