1) Cash - this is the fastest and easiest method.  bank transfers can be slow and create trust issues due to the timing of payment arrival therefore cash is ideal unless budget is very high. 

how to:  Bring USD or Euro with you (you are allowed to bring up to 10,000usd per person) then change them at the AFEX office (not the one at the airport its more expansive). 

2) Credit card/Debit:   this method is also easy and quick,  however has commissions and can only work if you buy from a car dealer that has card payment (this eliminates many good cars from particular sellers)

3) Remitly - a decent service that can either provide quick bank transfers or send you cash (limited to 2,000,000 in most cases) 

4) transferwise - easy wire transfers. 

5) bank transfer - the slowest and most expansive.

How to Pay for a Vehicle bought in Chile
(All Options)

How to Cross Borders with a Chilean Vehicle in South America

Since August 2018 there's a law for tourists crossing to argentina with a Chilean vehicle https://www.aduana.cl/solicitar-permiso-para-el-ingreso-o-la-salida-temporal-de-un-vehiculo/aduana/2019-08-05/123824.html
Using our  "Premium Full Service" "Full Service" or Border crossing package it is possible to cross borders.
We provide our clients with all the necessary documents, a border list and a trip planning session.
During the first month after purchasing the vehicle you can only cross to Argentina using a permission from the seller.  
once you receive the padron(ownership document) (we can send it to you) you can cross to any other country from Argentina. 
* it is not possible to cross directly from Chile to Peru for tourists.
* it is difficult to cross directly from chile to bolivia but might work at specific crossings.
From Argentina it is possible to cross to any other country. 

How to Cross Borders with a Chilean Vehicle in South America

So you arrived to Chile, got a local sim card but it still doesn't work?
A new  law says that all foreign smartphones need to be registered with a foreign phone registering company. 
 
This is what you need to do:

Go to http://ingeaudit.cl/personas-naturales/
Choose the option of:
Remota-ingresar solicitud de certificado
Fill up the form and send the following documents accordingly:
1. A picture of your Passport
2. PDI immigration paper (when you entered Chile they left it or stapled it in your passport) 
3. Digital IMEI- Screenshot with the IMEI number, you get that by calling *#06# , you will receive a barcode with numbers, screenshot that. 
4. Physical IMEI- Picture of the IMEI number engraved on the phone. ON iPhone it is engraved on the SIM card holder with android phones usually behind the battery
You will receive an activation email, open it and press the link they sent you. 
Your phone should be activated in 72 hours.
 
 
Good luck and may the force be with you (you will need it).

How to Register a Foreign Smartphone in Chile