Brad,
I thought lead was originally added to gasoline to act as a lubricant for  
valve seats. Now your adding MMO to unleaded gas to remove the lead. So where do 
 the valve seats get their lubrication?
I've been using Mobile One for almost twenty years in all of our vehicles.  
I've never had an internal engine failure and always put a lot of miles on our  
vehicles. We retired a Pontiac Grand Prix a few years ago that 315,000 miles 
on  it and it didn't burn any oil. You pay more for the oil up front, but the 
peace  of mind I get from using it is well worth the price. I put a lot of 
miles on my  truck and sometimes I can't get the oil changed on time. I usually 
try to change  it at 3,000 miles, but have gone as far as 8,000 on several 
occasions. I know,  everything that has the word airplane or avionics attached to 
it costs more.  Just like buying marine items.
 
Rummy