Fellas,
It's happened three times in a row so I know it wasn't just a fluke. I recently switched from using M1 oil filters to AC Delco oil filters in my truck. After every oil change, for the first 5 or so cold starts, I get horrendous lifter noise. The lifters won't shut up until I shut the truck off, then restart. On restart it's nice and quiet. Oil pressure in either instance is 60 psi. After the first 5 or so cold starts with all the bloody racket, all is back to normal until the next oil change.
This never happened with M1 filters which I've been using for the past 5 years or so on this truck.
Any thoughts??
Doc