Can you swap an­tifreeze types?

Canal Boat - - Back Cabin: Experts -

QI am chang­ing the an­tifreeze in my Beta 43 en­gine and wanted to use the red longlife rather than the two-year blue. Would it be suit­able? MICHAEL MARSH, via email

QTONY REPLIES: I can see no rea­son to to this on some mod­ern en­gines and cool­ing sys­tems. The vi­tal thing is to get rid of all the old an­tifreeze first, oth­er­wise there could be a re­ac­tion be­tween the two. When I changed from blue to red I drained the sys­tem, re­filled with wa­ter and ran it up to tem­per­a­ture and drained it three times to en­sure vir­tu­ally no old an­tifreeze was left. How­ever, Beta rec­om­mends us­ing eth­yl­ene gly­col based an­tifreeze that con­forms to BS6580: 1992 with a ra­tio of 50/50 wa­ter/an­tifreeze; not us­ing this would in­val­i­date any war­ranty.

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