1996 Ford Bronco Owner's Manual - Page 288

The API Certification Mark Never use: u "Non-Detergent" oils u Oils labeled API SA, SB, SC, SD, SE, SF or SG u Additional engine oil additives, oil treatments or engine treatments For vehicles with 5.8L engines Engine oils with an SAE 5W-30 viscosity are PREFERRED for your vehicle. They provide the best engine performance, fuel economy and engine protection for all climates down to -15˚F (-25˚C). Synthetic engine oils which are CERTIFIED and of the preferred viscosity may be used in your engine. The engine oil and oil filter must still be changed according to the maintenance schedule. For vehicles with 5.0L engines Engine oils with an SAE 10W-30 viscosity are PREFERRED for your vehicle which provide the best engine protection for all climates down to -5˚F (-20˚C). SAE 5W-30 engine oils may also be used down to -15˚F (-25˚C). 291