There are many brands that will be ok, and using the data sheets from the Manufactures you can tell from Sheer rating. In order to be rated at 15-40, the sheer leve must meet what you need for flat tappet wear camshafts(Yours)
If I were you, I would use 15-40 Rotella T Year round. That isnt th eonly choice out there, but it is a good one, and avalible everywhere.
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