You might consider a zinc additive with your oil. The newest motor oils have reduced zinc content to prevent catalytic converter fouling, to the point that the new oils would not be suitable for engines with the flat lifters.
1935 QD 1.5 ton stake bed 1937 SD 1.5 ton stake bed 1944 MS 1.5 ton stake bed 1946 PW 2 ton stake bed
