[BobALou]

To close the loop on my "blank" OAT coolant filter question, above, I spoke to a seated coach operator, today. The filter used for OAT coolant does have filtering media in it. They change them at 100K miles. What I didn't realize was that the filters used for SCA coolants don't actually filter, rather, they have layers that dissolve once the levels in the coolant drop and, thereby, release the next batch of chemical. All you gurus probably knew this, already, but in case there's a wannabeguru, like me, reading...

Anywho, thanks for the thread.