Hello I have a 2000 Avensis 1.8 Auto 7A-FE. We have a small leak in the top housing of the radiator. I intend to replace the hoses, clips and thermostat while I am fitting the new rad, so thought I would flush the system and fill with Red OAT. The coolant I intended to use is the Triple QX from Euro car parts Is there a known problem with using this type of coolant on the older Avensis? Also, can anyone tell me where to find the engine block drain plug on this model? Haynes manual says there is