[Synchro909]

Grease every 500 miles or as close as I can get. Oil change depends on how I have done the miles. For short runs, 1,000 to 1,500 miles but on long outback runs, I watch the temperature gauge, speedo and oil pressure Day after day, they sit at 170F,50 mph and 26 psi (I made a pressure relief valve and aimed at 25 psi). Eventually, the pressure starts to drop - 25 - 24 psi but when it gets to 23 psi, I figure the emulsifiers in the oil are shot so I change it. Immediately, it returns to 26 psi. I can set my watch by that happening at 3,600 miles.
That engine has done about 70,000 hard miles towing a camper that weighs about 900 kg (one US ton) at 50 mph for at least 55,000 of them and is still going just fine. I see no reason to change my intervals.