BYD — Owner Guides

Written and edited by Ethan Cole, Editor-in-Chief · ✓ Technically reviewed by Daniel Wei Chen — Senior Chinese Automotive Diagnostics & Repair Specialist, Sydney · 21 August 2026.

BYD’s Australian range documented model by model: the alternating A/B service pattern, year-8 services that land exactly on the battery-warranty boundary, government efficiency figures — and the cleanest recall record of the four brands.

Six BYDs, three drive-unit oils — match the number, not the brand Official drive-unit / reducer gear oil and fill amount per model (official owner’s manuals) Castrol BOT384 Atto 3 — 600±50 mL (Castrol ON D2 also accepted) Dolphin — 450±50 mL (Dynamic 70 kW) · 600±50 mL (Premium 150 kW) Shark 6 — rear drive unit · 1.3±0.1 L Castrol BOT-383 Seal — rear 1.5 L · front (AWD only) 2.0±0.05 L Sealion 7 — rear 1.55±0.05 L · front (AWD only) 1.6±0.05 L Shell S3-ATF-MD3 Sealion 6 PHEV — rear drive unit (4WD only) · 0.8 L A workshop stocking “the BYD oil” for Atto 3s does not have the Seal’s fluid — three answers under one badge. Data: official BYD owner’s manuals — Australian editions (Shark 6: Middle East) · per-model fluids guides · dragonautoguide.com
One badge, three gear oils. “The BYD oil” does not exist — match the fluid number to the model, every time.

Models & guides

Atto 3 →

Dolphin — the efficiency record →

Seal →

Sealion 6 PHEV →

Sealion 7 →

Shark 6 ute →

BYD Recalls Tracker (weekly) →
Fault Codes in BYD Context →

Every technical figure on these pages is verified against official documents or two independent sources before publication — our editorial policy explains how, and our corrections page shows what happened when we got something wrong.