| $10k upfront is going to save you more than $10-$20/month simply based on the laws of compounding. @ $20/mo for 30 years the total difference would be $7,200
That doesn't even count the fact that having the number smaller at the beginning makes less interest over the life of the loan. I won't sit here and work the numbers for you, but it would be alot more than what you said off-the-cuff, be assured.
Though, as you state, it makes little sense if he's just going to buy another to invest in all over again.
Getting these cars in prime shape and modified, even slightly costs as much as he'll sell his car for.
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