Not all BMW Z3 manual gearboxes use Automatic Transmission Fluid (ATF). Some, particularly early models, use ATF, others require specific Manual Transmission Fluid (MTF-LT-1 or MTF-LT-2). The correct fluid is determined by a sticker yellow, orange, or green on the side of the box. you need to check the label on the gearbox.
| Yellow | Manual Transmission Fluid | Gear oil (approx. 90‑weight MTF) |
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| Orange | Automatic Transmission Fluid | ATF (e.g., Dexron III) |
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| Green | Not Z3‑specific; seen on older BMW gearboxes only | Special oil (Mobil SHC 630) — not applicable to Z3 |
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