Well it was their first time using it ever so I dont know what the hell they did. The fluid seems to be a little gritty but it doesnt smell burnt so maybe it is flushed. Plus I didnt want to do a drain and refill 2-3 times. its too much. I'd rather do a one time flush and thats it. At 55k I did a drain and refill but not since then until last sat. I got 87k on it now and I know how the CD4e's are and I hope I can get 140k+ out of it.Maybe at another 20k ill do the flush again to ensure that the fluid is out.