I just recently attempted to flush and fill my rad and noticed a strong smell of diesel fuel in the antifreeze so I took the truck to a local diesel repair shop. they said I have one or more cracked injector cups. It turned out to be just one cracked cup. they charged me 12 hours labour plus parts and while they were in there I told them to put new glow plugs in also rather than put the old ones back in. the truck has 140000 KLMs. This type of repair is beyond my skill level so it cost me dearly but if you can do the work yourself then go for it.
Easiest way to check for oil dilution is to pull the dipstick and wipe it on a white napkin or something white. If you have diesel fuel in your oil, you will see it seperate. The oil will remain in the middle and the diesel fuel will separate and make a ring around the oil. Injectors are your problem. The fuel will leak into your crankcase causing high oil levels on your dipstick.
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