Carrefour motor oil: the €18 bottle made on the same line as Elf

Carrefour oil at €18: same factory as Elf, doubts over additives

A tax ID number on the label, A-78428455, points to ELF OIL ESPAÑA, S.A., a subsidiary of the Totalfinaelf group. That is the starting point of a debate that has been dragging on for years among drivers who refuse to pay €32.90 for a jug of Elf Excellium when the supermarket's own brand costs €24 and, with the half-price second-unit promotion, works out at €18 per five litres. The saving, €14.90 per container, is the kind of figure that makes anyone who changes their oil twice a year raise an eyebrow.

The question is whether that saving is paid for in some other way. The short answer: nobody knows for sure. The long answer is this article.

What the manufacturer says and what can be verified

The tax ID on the container corresponds to ELF OIL ESPAÑA, S.A., whose parent company is Totalfinaelf España, S.A. The group's brands are Total, ELF, Gulf and Fina Oil. Judging by the ACEA A3/B4 and API SL/CF specifications, Carrefour's 5w30 and 5w40 oils match the group's mid-range: Elf Excellium, Total Clasic, Fina First 400. What could not be established is which specific range it is, or whether the group bottles exactly the same product under different brands. It is also unclear whether the oil Carrefour sells has a different formulation or just different packaging.

The 5w50 case is murkier. Among the group's brands, only Fina Oil has ever made a 5w50, and it no longer appears on its website, although it can still be found in markets such as Japan. Some claim it is made by Mobil, Carrefour's supplier until 2005, but that hypothesis clashes with one detail: the container carries the same tax ID as Total.

The additives argument: cheap oil is not the same

The most common objection questions not the origin but the formula. Additives are one of the items that drive up the cost of a high-quality oil, and the suspicion is that own brands carry the bare minimum. Being made by a premium brand does not miccionan it is the same product: it can share the same base oil and certifications while carrying a different additive package.

Hence the advice not to stretch oil change intervals. With a cheap oil, running the engine to 15,000 kilometres or more is a gamble many are not willing to take. In older or simpler engines the risk is diluted; in modern engines with long service intervals, the margin narrows.

The API SL standard: a 2001 oil in 2014

Carrefour's 5w40 meets API SL, a standard from 2001. Later categories exist, SM (2004) and SN (2010), which are more demanding. That detail matters: an oil can meet the specifications in your car's manual while still lagging behind the current technical frontier. For an eleven-year-old naturally aspirated petrol engine, SL is sufficient. For a new engine with a particulate filter or long service intervals, things change.

The 5w50 and motorcycles: the unexpected niche

The 5w50 has an unexpected audience: motorcyclists. API SL oils contain no friction modifiers, which damage the wet clutches most motorcycles use. Add to that the fact that motorcycles need more frequent oil changes and that 5w50 is expensive, and the savings multiply. A comparison test by a French magazine ranked the Carrefour oil second in value for money, behind another own brand, Extralub. On Spanish and French car forums there are no negative reviews of Carrefour's synthetic oil — quite the opposite — and nobody reports breakdowns attributable to its use.

The Renault Supercinco case: 5w30 in a 1988 engine

One specific case illustrates the limits of the debate. A Renault Supercinco Baccara, with a 1,397 cc Sierra engine producing 72 hp and a twin-choke carburettor, nearly 26 years old with 79,000 genuine kilometres, switched from a mineral oil to a Carrefour 5w30. The engine started sounding smoother, more refined, and runs cooler. The oil level did not drop a single drop over the first 1,000 kilometres. But the warning from the old hands is clear: a 5w30 is far too thin for that engine; the norm would be a 15w40 every 5,000 kilometres or a 10w40 semi-synthetic every 10,000. The recommendation is to check the dipstick every 1,000 kilometres and never go from SAE 5W to 0W in an engine like that.

Own brands as a category: Alcampo, BOLK and responsible consumption

The pattern repeats with other own brands. According to one driver's experience, an 85 hp 1.5 dCi diesel runs better on Alcampo's 5w synthetic than on the oil used in the manufacturer's official service. A 21-year-old car with 295,000 kilometres has run for eleven years and 190,000 kilometres on Alcampo oil without problems, and starts better in the cold than it did on the previous Selenia 10W40 semi-synthetic. The BOLK brand, available from a parts website, meets SN for around €24 delivered.

The advice that keeps coming up: look at ACEA, API and SAE, not the brand. Manufacturers are not going to develop a new oil and pass all the tests for an own brand; they use the same one. But the manufacturer can change, and that is the problem: an own brand does not guarantee continuity of supplier.

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The question left hanging is not whether Carrefour's oil is good or bad, but whether the saving of €14.90 per jug is worth the uncertainty over the additives. For an old, simple engine, the answer seems clear. For a new one with 30,000-kilometre intervals, not so much. And in the meantime, the tax ID on the container still points to the same factory as the Elf that costs almost twice as much.