If it's worth 18k when you're done with it, I'd put it up for sale for $8k and see if anyone bites. Give it a month and if no luck, go ahead and fix it.
Past a certain mileage, I dont think an m3 is worth much with how much it costs to refresh. So at 150k you're looking at spending to enjoy it because you like it. You're not going to get a whole lot of resale out of it.
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