well tonight i was at wally world looking at oils. Unfortunatley they didnt have the 5 quart jugs of 0w-40 in stock. I did some research online and found the Shell Rotella T is supposed to be a very good oil and since its for diesel engines might have different additives in it. I plan on using it in my 540. Anyone else use it? For $16 for a 1 gallon container I picked up 2. Might be a little cheaper to do a 3,000 mile oil change with this stuff.