The cooling line method is post filter, drain plug is pre filter.ChattownXC70 wrote: ↑09 Mar 2025, 15:38
As to the flush and fill, I ordered 12 quarts or Mobil 3309 and will be doing this Wednesday or Thursday but am kind of torn between draining from the plug and refilling several times vs doing th cooler line pull method. I couldn’t really find any definitive info as to one being better than the other. Anyone have any insight on which to do?
Again, I appreciate the replies and helpful info!
I've never done it myself but I think its best to drain the unfiltered fluid.