I just changed the oil about 1k miles ago and did not want to post too soon on my findings. I used mobil1 0w40 and added 1 qt jug of lucas synthetic oil stabilizer. Almost all of the lifter noise is gone. The temps of the oil have been between 185-220 and still no noise. I highly suggest that if you have a lifter noise that the 8.3 almost allways has...try this stuff. Don't buy the regular stuff...make sure you get the 100% synthetic.