Only thing I have seen about oil is wipe down tool bits with oil damp rag and I see in below link 5.1.3, tool bit should have thin layer of greases applied before inserting in drill. They suggest grease recommended by Hilti. https://images.homedepot-static.com/catalog/pdfimages/d2/d2cf0bbe-e315-47e3-acfc-1ed2676f63bd.pdf
Answers & Comments
Only thing I have seen about oil is wipe down tool bits with oil damp rag and I see in below link 5.1.3, tool bit should have thin layer of greases applied before inserting in drill. They suggest grease recommended by Hilti.
https://images.homedepot-static.com/catalog/pdfimages/d2/d2cf0bbe-e315-47e3-acfc-1ed2676f63bd.pdf
https://www.homedepot.com/p/Hilti-Chuck-Grease-203086/202294513
manual
https://www.hilti.com/medias/sys_master/documents/h3e/9243618902046/Operating-Instruction-TE-50-03-EN-US-Operating-Instruction-PUB-5283568-000.pdf
https://www.youtube.com/watch?v=_fu7lUYEVYQ
https://www.hilti.group/content/dam/documents/pdf/a1/singapore/malaysia-products-catalogue/Hilti%20Malaysia%20Product%20Catalogue%20Chapter%205%20-%20Drilling%20&%20Demolition.pdf