When it come's to Motor Oil be picky because alot of oil out there
is ****. Balaso I use Mobil one 10W30 in my mustang and never
had a problem.I do use RedLine 10W30 more than I use Mobil one
10W30 because it lubucates greater under track condition's and
street duty! I highly recommed Redline or Mobil one for all Mustang's
and if you have high mileage use 10W30 because the coat's and
protect's better because of it's thickness.
Balaso if you have
109,000 mile's you should expect problem's or rough idle because
of all though's mile's.I would use Valvoline Max Life as Vortex
recommed because Valvoline is great oil than coat's good to your moving
part's.Balaso that's funny because my friends' 95 GT never had any
kind of trouble useing Mobil one sny. and he has 91,533 mile's! I wish
you luck I hope you find the right oil to use.