DYI sells an antifreeze bucket that holds 5 gals with a "Y" valve so as the water goes through and the engine reaches temp, close the water valve and open the Antifreeze valve and let the antifreeze get sucked out of the whole bucket. You can find it at any marine store for about $60. Regarding 2 stoke mixed with gas and stabalizer, be careful on EFI set-ups, it can clog the injectors. If EFI, we use Marvel Mystery Oil. It is thin oil like fogging oil and won't plug up the EFI injectors.