I installed 4 exhaust fel pro (rock auto) valve stem seals today. MAJOR PITA! But, no smoke visible! I'll report on consumption, (still have AMSOIL 10w 30 in it with 2/3 of v8 "restore" recommended by my brother, master mechanic..(He really is and has certificates). Installed in it for 300+ miles, NO difference (so far bro says it takes 500 miles, but all exhaust seals replaced, and NO SMOKE!! Woo Hoo! All good Now! Seals on exhaust made it like new again.. Has better tq low, and more power high rpm. Wow, Major benefit!!