Can 2F preservative oil be mixed with 15W50? I have a 5 qt jug of 2F, but I'm wondering if I can mix this with a bit of the 15W50 remaining in my sump and oil filter to bring the total up to about 6 qts, without compromising the preservative characteristics of the 2F too much. I'll be shut down this winter for about 3 months.
