From everything I've ever read and learned from a buddy who was a Mobile outside salesman, Mobile One is good for 15K between oil changes in modern cars.  In 91 I bought a new Honda Accord and ran Mobile one like that for four years and 100K before selling it.  I spun a new filter every 5K but only dropped the oil every 15K.  Would have liked to have kept it past 100K to see how it did in the really long haul, but had to sell...

 

Great oil for sure!

 

doug