Engine kaput? For a Mazda 6, a used wrecker motor typically costs about $2,500–$5,000, with labour pushing a drive-in/drive-out swap to roughly $4,000–$9,000.
A remanufactured or rebuilt unit sits higher at about $4,500–$8,000 for the engine itself, usually landing $6,000–$11,000 fitted.
If you’re going “new” (crate/long block, where available), expect $9,000–$13,000 for the hardware, and around $11,000–$16,000 on the road after labour, fluids, and odds-and-ends.
Labour alone is commonly 12–20 hours at $120–$180/hr in Australia, and you’ll often need extras like gaskets, mounts, timing bits, and a fresh cooling system check.
Diesels and later-model 2.5L direct-injection engines can edge pricier; warranty length typically improves as you go from used to reman to new. Get itemised quotes from a specialist and compare against the car’s market value—no point fitting a gold heart to a budget torso.

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