Hey fellas I just got my second Pontiac Straight 8 today, first in running condition. So I want to do an oil change on it looks like the guy ran standard oil in it., Castrol 10w -30. But as I understand the internal oil filter setup of these engines, a non detergent oil would be a better choice. What do you guys use? Brand and weight, I live out in the heat 105+F. Coldest might be 45F.