Before this problem started, nozzle was replace then mixing began
Common issue when o-ring "seals" let go - usually after an overheating incident. A replacement sleeve with new seals and copper seat plus injector seal installed to correct tightening sequence is the trick. Make sure the bottom seal on the sleeve is well lubricated with petroleum jelly or grease and is the correct size. Oversize bottom seals will tear as they go over the fuel inlet holes in the head. That would mean replacement of that seal. Been there and done that!
Check out this forum. Injectors are leaking into the cylinder.
Replacement/repair is the fix.
4JX1 Mixing oil and diesel
SOURCE: My isuzu wizard 1999 model diesel mixes with oil,
If oil mixes in the combustion chamber, then you're up for an engine overhaul. Nozzle changes won't do.
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