I ran a little tug for the paper mill here. It had a 343 Cat. I changed lub oil and filters every 125 hours, 8 gallons of Delo 400. The engine was rated at about 400 HP if I remember right. Now that seems like allot of lub oil changed at short intervals compared to automotive diesels. Also It was not turned up over 1800 RPMs.

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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"