I believe if a person always runs there car on E they will have fuel pump issues.
My Daughter is a good example of this and still won't listen
3 fuel pumps on 2 different cars.
Just keep doing what your doing. If it is sludged up you don want it all comming loose on one oil change or the filter will clog up.
I would use Mobil 1 HM
That's what I use in my 2003 5.3