yep Valvoline VR1 is what I use in my 261. I just changed da oil today and put in 15w40 Rotella in the 305E. Actually got it started for the 1st time since piecing together. Far from done tho. Idled at 55 psi oil pressure. I was impressed to say da least. So whats the thought on a zinc oil additive?? Needed or not? I know it wont hurt, But NEEDED is the question???
