chessman21
New Member
- Joined
- Jan 7, 2016
- Messages
- 75
- Reaction score
- 0
- Points
- 0
- Vehicle Year
- 1969 f-600hd
- Make / Model
- 1991 ranger 4.0
- Transmission
- Automatic
fixin to change oil/filter on my 91 4.0 to see if it helps the spastic oil pressure needle after 30 minutes of driving sitting idle issue. and i was wondering with 170k on engine should i use high mileage conventional oil or a synthetic oil and also, i live in Sc should i be using 5w or 10w30?