2004 RX8 GT 6sp, 56000mi, castrol GTX 20w50 3000mi OCI, . so under the hood today i noticed one of my MOP lines have this brown powdery gunk in the line about 1/2 inch long. Is there a way to suck this crap out or push it out the motor end to get burned up? it would be nice to purge all 4 lines, but how? anyone have this before?

 

This may help
https://www.rx8club.com/series-i-tech-garage-22/possible-new-renesis-engine-failure-theory-210194/

 

thanks. so i got out of it that i should replace all the lines and oil injectors. Since the damage is probably already done( my oil hasnt gone down noticeably over the past 3, 3000mile oil changes) are those items normally replaced when the engine core gets replaced for low compression or internal failure?

 

No. As far as I know, the only things that get replaced are seals, rotors and housings (engine internals)
To be honest, I have yet to look too deeply into the MOP issue. You should be able to get some new ones from Mazmart or another vendor and replace them yourself