Could b injecor seals but sometimes main diesel pump front seal can also leak. On some models allowing diesel to pass into sump via timing belt or chain
One of Your injectors seals are worn allowing the diesel to escape back up and get into the oil galleries. I would change all the seals. They cost around 40 pounds on ebay. Remember to use new bolts for the injector holders and the the rocker arms.
Bad injector O rings.
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