My sons 1980 300sd had to have upper oil pan replaced. We pulled one from a 1979 300sd after checking that the part numbers on the pans matched. Well today we installed the upper oil pan and found there’s only one inlet to the upper oil pan it is for the turbo oil return line there’s no hook up for the oil caused by blow by to return to the crank case. There’s also the dipstick inlet I don’t have the 1979 300sd air filter housing which on the 1980 model contains an oil separator that then drains down to an inlet in the upper oil pan. Can any one explain to me how the 1979 300sd dealt with the oil mist created by blow buy I doubt they just vented it to the ground. Did they use some sort of baffles in the valve cover to eliminate the need for oil separator and return line to crankcase I am stumped.
Thanks Dave