I’ve been there many times and would suggest tha

I’ve been there many times and would suggest that your year estimate is way too long. They can fix the issues quickly if parts are available. They will also have to make sure that heat is provided to ensure that freezing doesn’t happen again. Again, if parts are available in a timely manner and they are using only premium feedstock, 3 months is doable. Adding free used oil is a bonus to the process