It is going to be in the 50's this weekend so my '51 Flat 8 is going to get an oil change. I need to know the capacity, no oil filter, and the oil weight. Additives aren't relevant, as I have stocked up on some ZDDP so I just need the proper weight. IIRC they were sticking straight 30 in them back in the day so I assume 10w30 would work but want to make sure.