Oil??

I run two oils.One in the Grand Caraven is Castrol Syntec 5-30.Works excellent and so far Im pushing 212 000 Km's.The engine runs flawlessly and is a 3.8 litre.I have gotten as much as 34 mpg out of it.Not bad for a flying brick.
In the hunting rig ( sorry,g.m) I use Mobile 1 hi mileage synthetic,10-30. Stock 350 with throttle body fuel inj.It's due for it's second change soon since I bought it. I dont pull down a lot of miles in this truck as it needs some work and also used mainly for hauling and hunting.So far so good,runs quiet.I gotta get off my *** and pull it off the road next spring for repairs etc.