BYD Seal — Fluids, Capacities & Specifications
Written and edited by
Ethan Cole, Editor-in-Chief ·
✓ Technically reviewed by
Daniel Wei Chen — Senior Chinese Automotive Diagnostics & Repair Specialist, Sydney · 22 August 2026.
The Seal’s official fluid sheet holds the family’s biggest trap: its e-axles take Castrol BOT-383 — not the BOT384 used by the Atto 3 and Dolphin. Two siblings, two oils, one digit apart on the label. The AWD adds a front drive unit that holds more oil than the rear one (2.0 L vs 1.5 L), and the tyres run staggered pressures — 250 kPa front, 290 rear — the kind of detail a quick-lube shop levels out by habit.
Fluids — official specifications
| Item | Specification | Amount |
|---|
| Rear drive-unit gear oil (all versions) | Castrol BOT-383 | 1.5 L |
| Front drive-unit gear oil (AWD only) | Castrol BOT-383 | 2±0.05 L |
| Brake fluid | HZY6 / DOT4 | 1.15±0.05 L |
| Motor-controller coolant | Glycol OAT long-life, −40 | 4.8±0.2 L (RWD) · 5.3±0.2 L (AWD) |
Source: official BYD Seal owner’s manual, Australian edition (Vehicle Data pp. 202–204; archived with checksum). The BOT-383/BOT384 split matters: a workshop stocking “the BYD oil” for Atto 3s and Dolphins does not have the Seal’s fluid — match the number, not the brand. (We documented the same one-family-two-oils trap on MG’s manual gearboxes — it keeps paying to check.)
Powertrain — the mixed-motor AWD
| Rear motor (all) | TZ200XYC / XYL — permanent-magnet synchronous |
| Front motor (AWD) | AC asynchronous (YS210XYA control) — a deliberate PMS+induction mix |
| Gradeability | RWD ≥30% · AWD ≥50% |
| Battery | Blade LFP, 150 Ah |
Workshop data
| Tyre pressures | Front 250 · Rear 290 kPa — staggered; equalising them is the predictable mistake |
| Tyres | 225/50 R18 · 235/45 R19 |
| Alignment (kerb) | front camber −0.5°±0.75 · caster 6.33°±0.75 · rear camber −1°±0.75 (full toe values in the archived manual) |
Disclaimer: Information on this page is general guidance only and does not replace the manufacturer’s official documentation or the judgement of a qualified technician. Never open, touch or work on any orange high-voltage component. Specifications vary between markets and production years. Last verified: 22 August 2026 · Next re-check: November 2026.