Yes, replace everything. I'd flip a coin on the tentioner. The chain probably doesn't have a master link and it will have to be cut (the rivets are ground off a link with a carbide cutter and a link is disassembled. We then keep a clip style link to join the new chain to the old to roll through the motor. Then we install and crimp the permanent style master link.

The oilers are easy so I'd probably just replace them but there really is no need as long as the tube is firmly mounted (no loose attachments).

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician