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Have looked for the PureOne, and had no luck. Where did you find them?

Advance Auto has them. Wal Mart's house branded SuperTech 6607 is another excellent choice made by Champion Labs. Don't be put off by it's $1.97 or so cost. Or get any CarQuest filter (they're made by Wix).

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Also, about oil - the Shell Rotella-T Synthetic carried at the local WalMarts here in Houston is 5w-40. Any thoughts on that?

That is the single reason I won't use the Rotella syn during my warranty period. Same applies to the Amsoil syn since they don't market a 15W-50 either. Motul ester is a like-for-like alternative though.