If you want to verify its rings, remove GPs and give each cylinder a couple squirts of oil (I use 1/2 ATF and 1/2 lub oil) it might even start with the compression boosted in this way. If the compression doesn't improve its the valves.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"