Perhaps it'll be useful to add some real numbers to this discussion...
This is an example using real numbers from a quote I received from an Audi main dealer, and using a loan from sainsbury's bank.
The pcp is based on a price that incorporates a £2500 deposit from Audi. This at the time was the standard for a 3 door S3. The contribution was not offered if Audi finance wasn't used;
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This is eye opening to know what it would cost you over 3 years as I didn't realise it would be that close, BUT the loan from Sainsburys would obviously see you actually owing nothing on the car after 3 years and being the owner. Whereas on the Audi one you would have the balloon payment to worry about at the end to be in the same position.