I have 2 5qt containers of PU 5w30 and 3 QT's of Kendall GT-1 Full synthetic 5w30. My Ford EB requires 6qt's on a change. I was wondering if anyone saw an issue with using 5qt PU + 1qt GT1 per change? That way I don't have to open the second 5qt container. Both oils are SN if it matters.