MG4 (2022–present) Fluids & Capacities

MG4 guides: Overview Service schedule Running costs Oil & fluids Problems Recalls (MG)

✓ Technically reviewed by Daniel Wei Chen — Senior Chinese Automotive Diagnostics & Repair Specialist, Sydney · 24 October 2026

The MG4’s fluids are few but very specific — including a detail that catches workshops out: the A/C refrigerant charge differs by ~80 g depending on whether your car has a heat pump (660±20 g with, 580±20 g without). Everything below is from the official owner’s manual, per variant.

Cooling circuits (OAT glycol)

High-voltage battery pack	4.0 L (Middle East manual, 2WD and 4WD; other variants unread)
Electric-drive circuit	5.6 L (2WD) · 6.4 L (4WD)

E-drive transmission oil — Shell E-Fluids E6 iX (SL2808)

Unit	Capacity
Rear drive, 125 & 150 kW motors	0.85 L
Rear drive, 170 & 180 kW motors (4WD rear / 77 kWh)	0.9 L
Front drive (4WD only)	1.1 L

Brake, washer & A/C

Brake fluid	DOT 4 — 0.8 L
Washer fluid	2.5 L
A/C refrigerant	R-1234yf — 580±20 g without heat pump / 660±20 g with heat pump. Check the under-bonnet label; regassing to the wrong charge degrades both cooling and winter heating.

The 12V battery

Maintenance-free per the manual — but note MG’s own advice for cars parked over a month: disconnect the negative terminal, and put the car in READY mode ~30 minutes weekly otherwise. Unverified owner report: from owner threads on mgevs.com, as our research notes recorded the report on 19 August 2026; we have not verified the report, and we hold no copy of that source. That source reports the MG4’s 12V battery going flat after the car stands. This page has also said that low-use MG4s that ignore that advice are a known source of flat-12V callouts; our notes record the drain, not callouts or how often they happen.

Correction note: The battery-pack coolant figure now names the manual it comes from and the variants that manual covers, and the drive-unit rows now use the manual’s own 4WD label instead of a model name the manual does not print. A sentence on flat 12V batteries in low-use MG4s is now labelled as an unverified owner report.

High-voltage boundary: checking coolant levels visually is fine; opening the battery-pack circuit or anything behind orange connectors is qualified-technician work only, and this site will never publish procedures for it.

Source: official MG4 owner’s manual (Middle-East edition), Technical Data p. 327 and Service & Maintenance pp. 293–294.

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. Last verified: 19 August 2026 · Next re-check: November 2026.