Popular Science - April 1976 on Synthetic oil

Our DPW mechanics used 15W40 diesel oil in the 4.6l Fords. When the mechanic told me I just shook my head and walked away. Apparently 2 different drums of oil in the shop was a trick they just couldnt manage to pull off.
 
Our DPW mechanics used 15W40 diesel oil in the 4.6l Fords. When the mechanic told me I just shook my head and walked away. Apparently 2 different drums of oil in the shop was a trick they just couldnt manage to pull off.
Was there a problem because of the oil use?
 
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