I have a 2006 Volvo XC90 that is low on coolant, and I want to change it. Since the coolant is low anyway, I will flush it, but I'm wondering what type of coolant to get.
The manual, of course, recommends only Volvo OEM coolant ($$$). I don't feel this is good value and I don't want to reward Volvo for vendor lock in, so I want to take my chances with an aftermarket coolant.
There are several different types of coolant available, such as IAT, OAT and HOAT. I can't tell which of these the OEM Volvo coolant would fall under. Is any of these types going to perform notably better or worse? Do any of them have more or less chance of damaging the engine, beyond the supposed risk from not using the OEM coolant?