F frwgt350net Member Feb 28, 2026 21 14 13 California Today at 5:41 PM #1 Today at 5:41 PM #1 Looking for opinions and or professional recommendations for oil viscosity for a 1986 GT 5.0 with 85k miles. Rock on and many thanks in advance.
Looking for opinions and or professional recommendations for oil viscosity for a 1986 GT 5.0 with 85k miles. Rock on and many thanks in advance.
Bullitt347 I have been doing it wrong this whole time 15 Year Member Mar 23, 2007 3,981 2,960 194 Middle of Maine 45 minutes ago #2 45 minutes ago #2 Stock was 10W-30 I believe. That should be sufficient.
