[trollface]

The best financial move is K-seal it, hope it holds long enough to trade it and the next poor soul has to deal with it.

Worst case ontario you're right back to where you are right now and less 50 bucks.

Mazda not going to fix anything. They're not going to offer you $1,500 less and HOPE to jesus the heads don't need to get decked lol. Any trade in they're already spending a G note on reconditioning/detail/dents etc, they're not doing head gaskets.

Mazda is in the business of selling and making money off cars fast, not sending heads to the machine shop. They're going to wholesale that by the pound at the next auction and give you 20 bucks.

You need to get that thing running for 10mins and sign the dotted line.

Is it morally wrong? That's up to you.