Well-the Mobil is obviously cleaning out your engine-that's good, You may also need to add some AutoRx. Mobil1 has a very good additive package with Moly. Chevron Supreme (Dino oil) also has moly-thjat might be a consideration. In any event you might want to go to a 40 wt-it might help the piston slap. 10W-30 Mobil1 won't get the job done. Adding a quart or two of 15W-50 to the 10W-30 Mobil might help. Redline is truly loaded with Moly. I believe one of the posters (Bror) has indicated it stopped the slap.
Mobil Delvac 5W-40, Amsoil 10W-40 could also work. Also check Shaeffers-might be your best choice:
http://www.schaefferoil.com/data/700.htm
Mobil Delvac 5W-40, Amsoil 10W-40 could also work. Also check Shaeffers-might be your best choice:
http://www.schaefferoil.com/data/700.htm