This may be a moot point as I'm coming up on 4K of the "rinse" phase on my second treatment of ARX. I did the first treatment "by the book" using Chevron Supreme for the rinse phase. Second bottle in, drove for another 1.2K and dumped the oil and filter. Filled the crankcase with 703 and went on my merry way. Now, with all the testimony and advise about ARX's "cleaning" taking place in the rinse phase, am I ok using the Shaeffer's? Its a blend but I don't know how much the PAO add will affect the overall cleaning during this phase. I do know the oil went from a nice green color to a slightly dark amber during this interval. Also, should I bother with a UOA on this or just dump it and do one on the next interval? TIA.