Just took delivery on a single owner 1985 300CD with 244k miles and complete service records. I spent a few hours cleaning up the engine bay. Having never owned a diesel before I am perplexed by some of the routine things people do at this mileage. Based on videos from the gentleman in Bellingham Washington it seems like I am looking at:

1. Adjust valves
2. Verify good compression
3. Replace the timing chain, it has never been done
4. Rebuild the turbo
5. The trap oxidizer was replaced by dealer in 1991. Does this mean they replaced it was something that does not need to be cleaned out, or did they use an updated trap that is likely to be clogged today? Will a standard trap bypass fit the new trap device installed by the dealer?

Does this seem reasonable?