Any one of them would be good.
Mobil 1 5W30...
Amsoil 5W30 or 0W30
I tend to find the best deal as I can and I change my oil every 10,000 miles
or 1 year for synthetic oil.
As for buying oil... it all depends on if you do your own work or you have
someone change it for you.
It is most likely that the camshaft and rocker are worn. Remove the
valve cover and turn the engine over till you see the cam lobe. It
most likely has a flat spot. If so replace cam and worn rockers.
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