Oil Cooler passages
 

I pulled mine out and the port one, has significant blockage
I am able to clean out all but one center passage :)
All hte outside passages still looked blocked, hard to get a wire rod in there to clean out.

Is it possible to still have enough water flow? Or should I look into replacing them?

Looks like I will be plumbing in some sea strainers :(

what are they clogged with? maybe put some muratic acid in there and let it do its job :)

Pebbles :( And not the Flinstone's Daughter either :D

Was able to get a lot of it cleaned out.
Wish our sionic machine at work was large enough, it does great vibrating things loose out of our steel filters :)