I was surprised when my machine shop told me to run Pennzoil long life diesel motor
oil in my FE. I have got 15w-40w in it right now. I used GTX before the rebuild. I can safely say that the engine has better
oil pressure and the
oil seems to be cleaner longer with the Diesel Motor Oil. I am very satisfied with the oil, 5000+ miles
Here is the link.
http://www.pennzoil.com/products/LongLife/pickups.html