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i still run this oil 7-9,000
Sure...
I have both in stash haven't used any 0/40 yet love the 0/30 here in MI,great cold weather or all year around oil seems smooth and no oil consumption in my GM vehicles,i think Chrysler specs 5/30? if you have no consumption i would say either would be a great fit,try the 0/30 see if it does anything for mileage for you i love the oil it seems thats what i always reach for.
I am currently using GC 0W30 in my van and, while the engine runs smoothly, I can definitely feel a drag on the engine and the gas mileage is down some. I think the Mobil 1 0W40 is very similar to the GC so I don't think I would be gaining much by trying the Mobil 0W40 ( but I don't know). I must say I have had no problems in cold starting in Minnesota with the GC. So I think I will try the Mobil 1 0W30 and see what the engine does.