Not really. Drove them for 25 years, also owned my own for 8 years. Yes, the oil companies' 'fact sheets' say use fully synthetic oil from one end to the other. 2 grand later...
But the 1984 owners manual shows its straight 30 weight monograde diesel engine oil or EP90. from one end to the other. These trucks (and all the cogs inside them) were designed and manufactured in the days well before synthetic oils were a 'thing'. So that's what I used, and it worked perfectly well for me...and the 350 mogs the Army owned, and still does.
Throughout the 80's,90's and into the 00's all Army vehicle bays sported 44's of 1330 diesel engine oil and EP90. That's all. (yeah, and brake fluid and a bit of atf for the power steering).
Brake pads were something you needed to know a bit about. Try buying them off Mercedes Benz, and yes you had to sell a kidney prior to rocking up at the parts dept. But I managed a truck load of pads for about $600. And they lasted 6 of the 8 years I owned it. It helped have an engine (exhaust) brake fitted, as that reduced the need for an awful lot of foot brake use.
On many occasions I had passengers bail, as (with tyre chains fitted) they would go absolutely insane places. And lightly laden it would return 20L/100km. Not bad for trucking along the road at 8 tonne.
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