MG HS Oil Type, Capacity & Fluids

One number to remember: every 1.5T MG HS — first generation or second, manual, DCT, hybrid or plug-in — takes 4.0 litres of 0W-20 (ACEA C5) at an oil change. The second-generation 2.0T takes 4.8 litres of the same grade. Almost everything else below differs by variant, so check yours.

Engine oil

OEM-verified: G1 UK manual (2021, p. 341) · G2 UK Range manual (2025, p. 388) · Middle-East manual (p. 387). Three documents, one publisher — the count is editions rather than witnesses, so the label here is the one our verification ladder gives an official primary document standing on its own, not the two-source rule. The two Gen-2 editions carry the same table, and they are close but not identical: 15 of its 16 rows match, one cell differs (the R-134a charge for the 1.5T - MT column — a figure in the Middle-East edition, a dash in the UK one), and two rows appear under different names. Their agreement confirms that we read the table correctly; it does not add an independent check of it.

Engine coolant (OAT glycol)

First generation: UK 2021 manual, p. 341 (non-PHEV) and UK 2021 PHEV manual, p. 334. Second generation: the table MG prints as Recommended Fluids and Capacities — Middle-East manual p. 387, UK 2025 Range manual p. 388.

The first-generation split reaches this table too. The first-generation PHEV has its own manual, and it prints a lower engine-coolant figure than the manual covering the rest of the first-generation range: 5 L against 5.8 L. This page carried the 5.8 L line alone until 27 August 2026, under a heading a plug-in owner reads as his. The figure is here so you can check a workshop quote, or match it against page 334 of your own manual. The same split runs through brake fluid and the refrigerant charge further down the page, under The first-generation split.

Gen-2 cooling circuits: what the manual prints, and what it leaves blank

The second-generation HS runs cooling circuits beyond the engine, and the manual prints a capacity for some of them and a dash for others. These rows were withheld from this page until now. Below is every one of them, tied to the column heading the manual itself uses. Where the two editions give a row a different name, both names are here; we haven’t picked one.

Source: the table MG prints as Recommended Fluids and Capacities, TECHNICAL DATA chapter — Middle-East owner manual pp. 387–389 and UK 2025 G2 Range owner manual pp. 388–390. Circuit presence cross-read against the Front Compartment diagrams in the MAINTENANCE chapter (Middle-East pp. 327–328, UK pp. 329–330). Every value was tied to its column by reading the rendered printed pages, not by text extraction alone. The same row sits on a different page number in each edition, so every page number on this page is printed with the edition it belongs to.

The two-faced dash. A dash in that table means at least three different things, and the table gives you no way to tell which. Sometimes the variant simply has no such component: that is the DCT gear oil row against the manual column, and the manual transmission oil row against the DCT column. Sometimes the component is fitted and the litres are not printed. And sometimes we cannot tell at all. We do not assume which of these any dash is until something outside the table settles it. On the intercooler row it means the circuit is there and the litres are not printed, and the maintenance chapter proves it: the Front Compartment diagram MG heads PHEV 1.5T lists a Water-cooled intercooler coolant expansion tank, and the one it heads HYBRID⁺ lists an Engine Intercooler Coolant Expansion Tank. On the power battery row, for the PHEV, it means something we cannot pin down — which is why the next paragraph states a limit rather than an answer.

What we will not say about the PHEV. The manual prints no power-battery coolant capacity in the 1.5T - PHEV column, and the Front Compartment diagram headed PHEV 1.5T lists six items, none of them a battery coolant tank. That is not evidence the car has no battery cooling circuit. The diagram covers the front compartment only, so it can show that a circuit exists and cannot show that one does not. So the honest statement is the narrow one: no printed capacity, and no claim either way about the circuit. Where the documents stop, we say so rather than guess.

The 2.4 trap. 2.4 is one figure attached to two unrelated circuits, one per generation. In the first-generation PHEV manual (UK, p. 334) 2.4 L is the electric drive transmission coolant. In the second-generation table it is the power battery coolant, and only in the column headed 1.5T - HEV. Work from the number instead of the row name and you have filled the wrong circuit. Match the row, not the figure.

The 7.2 twin. The second-generation table prints 7.2 twice, for two fluids with nothing in common: the 7.2 L coolant row for the PHEV and hybrid columns — the row named twice in the table above — and the automatic transmission oil (Shell ATF L12108) on the 2.0T. Take a figure from that table without the row name beside it and you cannot tell which of the two you have.

One row, two printed names. The 7.2 L circuit carries a different name depending on which manual is in front of you: Electric drive transmission coolant in the Middle-East manual (p. 387), Drive motor control module coolant in the UK 2025 Range manual (p. 388). Same cell, same column, same figure. We print both as printed and leave them unmerged, because deciding that two names describe one circuit is a technical judgement, not an editorial one.

No grade, and that is deliberate. You will notice we have printed no fluid specification for these circuits. The manual runs one merged Grade cell — Glycol ( OAT ) — down four cooling rows, the power battery among them. Whether a single product is genuinely approved for all four, the high-voltage battery circuit included, is not something we will infer from where a cell border falls. Anything involving the high-voltage battery or its coolant belongs with a qualified technician, not in your driveway.

Two names for one row, three hybrid names — and what would settle it

Two of the questions this page leaves open are about names rather than numbers. The manuals give the 7.2 L cooling row one name in one edition and a different name in the other. And those same two manuals print three different hybrid names — one of them the column heading the 2.4 L power-battery figure sits under. Both differences are printed in MG’s own manuals, and neither is settled here. This is what the documents say, laid side by side.

How each of these was read: the fluids-table column heading and the raised plus on the Middle-East manual’s diagram heading (p. 328) were confirmed against the printed pages rendered as images. The UK 2025 Range manual’s diagram heading (p. 330) and the Dynamic Performance Parameters column (Middle-East manual, p. 386) were read from the manuals’ text layer. Each is printed here as we read it, and we draw no conclusion from the difference between a raised plus and a spaced one.

A fourth name is the one we use. On our other MG HS pages we write the variant Hybrid+. That is the name we print, not a line from either manual, and it decides nothing: whether the three names printed across those two manuals all mean one car is a technical judgement, and our technical reviewer has not made it. It is also why every row of the Gen-2 cooling-circuits table earlier on this page identifies the variant by the manual’s own column text rather than by a model name — that string is how you tell whether a row is your car.

If you hold the document, we would like to see it. What settles a question like this is a printed line rather than an opinion, so what helps is a document:

• A page of your own MG HS handbook showing the table MG prints as Recommended Fluids and Capacities, with the market and edition it belongs to.
• A service schedule, a Warranty & Maintenance Handbook or a dealer invoice that uses either of the two names printed for the 7.2 L coolant row.
• An MG parts or workshop document listing a coolant under either of those two names.
• The variant designation as it is printed on your purchase, registration or warranty paperwork.

What a message on its own cannot do is move a figure. We do not publish a number without the document behind it, and we do not change one without a document either — so a reader’s document can settle these two questions and a reader’s recollection cannot. Both questions stay open on this page until our technical reviewer rules on them, and if a ruling changes a figure here, it is published, named and dated, on our corrections page.

Where to send it. Email corrections@dragonautoguide.com. The proxy in front of this site can rewrite an address so that it only becomes readable if your browser is running JavaScript, so here it is spelled out as well, which works either way: corrections at dragonautoguide dot com. Quote the line as it stands on this page, and name the manual, market and edition your document comes from. A photograph of the page in your handbook is the strongest thing you can send. We do not need your VIN or your registration number.

That address is a second one, not a replacement. Several pages here give a general address for reporting an error — our Corrections Policy, our Terms of Use and our About page among them. Both addresses are read, a correction report goes to the front of the queue wherever it arrives, and using the general address is not a mistake: that address is staying.

Transmission fluids

First generation: UK 2021 manual, p. 341 — the rows it names Manual transmission fluid and Double Clutch Automatic Transmission fluid. Second generation: the DCT gear oil row of the same Recommended Fluids and Capacities table — Middle-East manual p. 387, UK 2025 Range manual p. 389.

Other fluids — and the first-generation split

Two first-generation manuals, two different sets of figures. If you drive a first-generation HS PHEV, the left-hand column is not yours.

The first-generation split. Until 27 August 2026 this page printed the left-hand column alone under a heading that said “first generation” — and this page counts the PHEV as first generation everywhere else, so a plug-in owner had every reason to read that line as his. Brake fluid is where that matters: 1.0 L against a printed 0.8 L is a quarter more than his manual asks for. Brake hydraulics are not owner work. The figure is here so you can check a workshop quote against your own manual, not so you can top anything up. The second-generation manual prints 0.8 L across every variant it lists. It is the older generation that splits.