what is the best way to do this?

 

black on black touring?

not stock though, right?

and in response to your question....replace them

 

Mazdatrix offers an ultrasonic cleaning service that supposedly does a good job. I've also heard that a diesel shop can do a cleaning job to the oil coolers as well. You could also dunk the coolers in a bath of Simple Green, carb cleaner, gasoline, etc. and let them sit for a while, then remove and rinse out.

 

Garfinkle needed to have one cleaned out , he sent it to an aircraft certified shop.---- AMERICAN COOLER SERVICE, INC 921W. Mayfield RD. Arlington TX. 76015 ph,,817-419-8008 cost---$ 50

 

ok thanks.