At a recent car show, a few of us were talking about
oil weight choice for our engines here in the northeast and how the variable seasonal weather posed a problem for us. Essentially we have to run two different oils, one a summer
oil which is usually heavier and a winter
oil that stays lighter in the cold temperatures.
That said, it dawned upon me that I am not well informed on the historical factory reccomendation (FORD) for the 428 Police Interceptor FE engine. Does anyone know what oil weight grade was reccomended for summer and winter use by Ford back in the day (1966?)
I did a few searches on the web but came up dry.