Using water is a real problem in itself you have to use a TECALLOY Coolant it will save you a furtune in the long run at most use demineralised water as there is no heavy metals in the water. Allways use the same coolant dont mix. depending on the KMs of your motor and where you buy the reco motor it would be easier to get a good reco motor, price is best to ring around. research the suppliers.