the best oil for a diesel is rotella t 15w 40.
Gas Engine: 5w30 Diesel Engine: 15w40
oil capacity 91 ford 7.3 diesel
All today's Ford engines, both petrol and diesel, use 5w/30. This type of oil is readily available on supermarket shelves and the containers marked "Suitable for Ford petrol and diesel engines".
i believe 10w-30 and make sure its cj4 !!
diesel
I was looking at the 2010 Ford F-250 diesel supplement and it shows : With engine oil filter change ( 15.0 quarts )
You need to be specific as to engine type (diesel or petrol, and then which size or type of diesel or petrol), and also quote year and/or Mk number. All have different sump plugs, oil filters and so on.
10 quarts
According to the 2002 Ford F-350 , 7.3 liter Diesel Supplement : ( the Motorcraft FL-1995 engine oil filter is used )
5w30 synthetic diesel engine oil.
it is AMSOIL Synthetic Diesel Oil SAE 15W-40
2002 Ford Econoline 7.3 diesel oil capacity ========================================================= For a 2002 Ford E-350 , 7.3L DIESEL : With engine oil filter change : ( 14.2 litres / 15.0 U.S. quarts ) * according to the 7.3L DIESEL supplement