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 · 24 October 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 recalls we track for the brand, in Australia and the UK.

Correction note: This page used to call BYD’s recall record the cleanest of the four brands we cover, and to label its link to our Dolphin guide “the efficiency record”. We cannot stand behind either ranking, and both are withdrawn. See our corrections log.
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 →

Seal →

Sealion 6 PHEV →

Sealion 7 →

Shark 6 ute →

BYD Recalls Tracker →
Fault Codes in BYD Context →

Every technical figure on these pages is verified against an official primary document or two independent sources before publication, apart from figures we print with a label saying that we have not verified them or that we hold no copy of their source — our editorial policy explains how, and our corrections page shows what happened when we got something wrong.