Oil line plug/ low oil pressure on cold starts

Got some better snap ring pliers and took that extra lifter I had already replaced apart. Definitely had some dirt in it - no chunks, though. I think I'm going to take them all apart and clean them. I assume that dirt gets in between the bore and the inner piston and that gets them stuck?! I hope it's the last time the intake came off...

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I've been looking for an oil with at least 800 ppm of ZDDP. It appears it's not listed as ZDDP, but rather as Zinc and Phosphorus separately. One oil I can get locally for about 37 bucks is the Valvoline Advanced Full Synthetic 5W-30. It's got 830 ppm Zinc and 730 ppm Phosphorus. By the way, the Brad Penn oil has been renamed PennGrade1, but it's not available nearby and also quite pricey.