My fiancee drives a 1999 avalon her parents gave her after her CR-V was totalled. The car has about 170,000 miles on it. Her dad has owned it since new. It got regular 3k OCIs and runs well. I know it had new tie rods recently and we just put new tires and aligned it last night. I was wondering what the maintenance for this car would be like? The antifreeze is red, and manual calls for ethylene glycol only. Should this last 5 years between flushes? What about transmission maintenance? Is this v6 sludge prone? I think it has a timing belt, but not sure, when would it need to be changed if it does have one? I'm going to look through all of her receipts again tonight to see if i missed anything that has been worked on already, but any kind of things to watch out for would be appreciated. We are trying to figure out if it would be more financially feasible for us to keep this car until it dies or if we should trade it in for around $5,500 and get a nice used/program car with 30k or less miles on it that would also get at least 35mpg.