I have a 1997 Ford Explorer Limited with 4.0L SOHC with close to 89,000 miles. I am wondering what visocity of oil should I use Mobil 1 or Amsoil 5W-30. Or which you recommend? My friend told me to ask forums like this for a feedback.
I also have 1993 Ford Explorer Limited 4.0L V-6 with...
