I just bought 4, 5 quart jugs of Mobil 1 15-50 @ $22.62 ea. plus tax.
I have been using Castrol 20-50 for about 12 years in the 80 300SD, with no problems (changed at 2k-2.5k miles). Found this site, which is great, and find I am using the wrong oil.
Have two deisel Mercedes, after reading, searching and researching on here thought that would be the way to go.
Maybe I should have went Delo 400 15-40, a whole lot less cost.
Thanx for the help all