I have 2 5qt. Jugs of QSUD 5W-20 that I would like to use in a motor that calls for 5W-30. The system totals 5qt. I was thinking about using Rotella T6 5W-40 to bring the QSUD up to 5W-30 level, something like 3qt QSUD and 2qt. T6. Is there a chart somewhere that will show the correct mixture ? I would be happy to hear any ideas you my have for mixing this 5W-20 to get a nice 5W-30 blend. Thanks.