750 miles ago I put the RX treatment in my Saturn.I went back to dino oil as instructed.Upon looking inside the old filter I didn't see anything out of the ordinary.The oil was dark for only 750 miles.I was told to replace filter and dino oil[I used mobil drive clean 5/30] for the next 750;then add another bottle of RX.I just wonder if I could go a little longer with the RX in?Would it clean more if it was in longer?