I change my own oil at 50 miles , 100 miles 200 miles 400 miles 800 miles and I change oil & tranny same time, always hot after good run ,the dealer changed the tranny oil first when I changed it hot I got a lot of black crap out of it, I am now changing at 2500 miles and the oil looks like new, I am at 15,000 miles now ,
I did the same for the van, and the car,. van 240,000 miles, car still new, 5,000 miles ready for change to syn. oil,.
300i dt. the golden hawk