Schaeffers for me started out with Brad Penn 10/30 in my 331 sb switched to Schaeffers 7000 5/30 picked up .15 the next year I got a deal on some Gibbs xp3 picked up another .1 ran the same oil all summer, about sixty passes. on tear down at the end of the season I found almost no wear, the very large flat tappet cam looked great. started 2015 with Brad Penn 10/30 in my new Dart 348, after break in and one pass I switched to Schaeffers 5/50 picked up almost .2 big difference in how it ran. like to try some xp3 just to see.