I'm replacing the timing belt in a friend's 95 Camry in a few weeks, and I did notice the belt was replaced before. However, the coolant was changed a few times I assume by a quick lube shop using conventional green. I was thinking about switching it over to the proper Toyota Red coolant - I'll do a drain and fill up with water and a dishwasher tab and have him drive around for a day and while I have the water pump and housing pulled, a flush from a garden hose. Or shall I stick with conventional green and avoid any potential issues? I can still get conventional green in my neck of the woods.