i use redline shock proof,and put that in all the evos,gtrs and skylines i work on,on 1 particular gtr i worked on wouldnt get 4th without crunching,i changed the oil and put in redline and absolutly instantly out on the driveway it was smoother and and got 4th perfectly,also another gtr makes 550hp at all fours with standard gearbox and twinplate o.s giken with redline shockproof in it,and still goin strong for 3 yrs now,it could be the oil or could be luck,u decide.......