Welcome.

The all iron 617.95X turbodiesel is a tough, durable machine that will
give you a lot of miles and will "complain" a lot before it gives
finally gives up one day. By "complaints" I mean oil consumption, hard
starting, excessive crankcase blow by. But that's hopefully many miles
distant, especially if you do your part - maintenance.

Change the engine oil and oil filter every 5K miles. Use CI-4 Plus
diesel grade oil like Chevron Delo 400, SAE 10 - 40 or 20 - 50. The oil
holds soot in suspension so it turns black after about five minutes and
that's normal because not all the old oil drains.

The engine's valves are mechanically adjusted and that ought to be done
every 15K miles, (good to do in the fall, before the winter cold).
Poorly adjusted valves leak and compression suffers and makes for hard
starting, especially in cold weather - remember, it's a compression
engine. Change the two fuel filters while you at it.

Buy a spare 80 amp glow plug fuse a/k/a fusable link - costs about $1.
and hang the spare by a little wire near the glow plug relay on the left
fender. The link is under the plastic cover which slides UP.

Running the motor on Bio20 is fine but Bio100 will dissolve all the old
deposits in the fuel tank and lines and soon put that mess into the
filters now you're forewarned. Bio may also cause the old fuel hoses to
weep and leak; Vitron hoses sold by some Bio coops as kits solve that.