Changing automatic transmission fluid is preventative medicine, not snake oil. As a rule of thumb, do it every 60,000–100,000 km or 4–6 years in normal use — sooner if you tow, slog through hills and heat, or live in stop‑start traffic. Ignore the “sealed for life” fairy tale: fluid shears, oxidises and collects clutch material, and fresh fluid keeps shifts clean and the ’box alive.
Use the exact spec (ATF, CVT or DCT) and follow the maker’s procedure; many gearboxes need temperature‑based level checks and new pan/filter hardware. In Australia, expect roughly AUD $250–$450 for a drain‑and‑fill, $350–$700 with pan/filter, and $400–$800+ for a full service — flushes are controversial and not always wise. Signs you’re late: shuddering, flares, harsh shifts, or a burnt smell; at that point fluid may help, but it’s not miracle juice. If spanners aren’t your hobby, book a trusted mechanic via ServiceCentral and keep the glitter out of your sump.
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