I'll be changing the oil in my Legend and was wondering since I have the gallon jugs of Rotella, what should I use to top it off with. In other words, 4 quarts of Rotella and 1 quart of another oil. My Legend calls for 5w-30 and the Rotella is 5w-40. I have various other brands in my stash including: Kendall HM syn blend w/liquid titanium 5w-30, Kendall full synthetic w/LT 5w-30, Napa full synthetic 5w-30, QSHM 5w-30, QSUD 5w-20, PU 5w-20, PP 5w-20, G-Oil 5w-30. Honestly if Rotella came in 5 qt jugs I wouldn't be asking this question. I also have several quarts on MMO on hand. Thanks for any advice.