Short answer: it depends how many cylinders you’ve adopted and how spicy you’ve been driving. In Australia, a typical rebuild on a BMW 4‑cyl lands around AUD $5k–$10k, a 6‑cyl about $8k–$15k, and V8/M engines can run $15k–$30k+ once machine work and quality parts join the party. A new/reman “crate” engine can be $12k–$35k+ before fitting, while a used import/low‑km engine might be $3k–$10k plus $2k–$5k to install. Labour rates of $140–$220/hr add up fast, and extras like turbos, injectors, timing sets or VANOS bits can nudge the bill north. If you’re price-sensitive, a good used engine swap is usually cheaper; if you want long-term peace of mind, a thorough rebuild with reputable parts is the grown-up move.
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