Advice on car loan

About to buy a second hand Isuzu MuX and sell the mrs old car. We have about 15k in the bank and are planning to borrow about 20k on top of that. The car we’re selling will probably only sell for 3-5k so we’re just putting most of that bank into savings.

We bought our house using Aussie as our mortgage broker last year, is there any point in using them or better off just going straight through our bank? Should we finance through a dealer?

Also I understand it’s better to never get a loan for a car. However her car is about to shit itself and I have a work car I can only use for work - we want something reliable that we can take camping and keep for a long time

Thanks!