Diehard Rams Fan
if you do a drain and fill most of the fluid will be new. In the example used it was 80% new, 20% old. If you do that every 5 years you aren't going to be much different than flushing every 10 year years. Don't be so overly worried about every little detail. Zoo a flush every 10 years or a drain and fill every 5 years, no big deal.I don’t know so I am asking. Doing a drain and refill when you mix the new and old coolant it does not cause leaks or problems.
It’s time to change my coolant I just don’t know what I want to do flush or drain and refill. Thanks.