I had a professional shop rebuild my 1968 Ford F-250 45x4 with FE 390 with a roller cam. It is for my farm truck that will be used for logging roads and short freeway runs to the dump. I am having FE specialties break in the motor prior to install. I have always used Swepco 306 oil in my flat tappet engnes. Will it be ok to use swepco (I was thinking the 5-30 due to the cold winters) even though I don't have a flat tappet cam/lifters? My other consideration was Kendall GT-1 liquitek 30wt.
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